- [x] I have searched the [issues](https://github.com/apache/incubator-dubbo/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.0
* Operating System version: mac
* Java version: 1.8

### Steps to reproduce this issue

1. Start dubbo provider in 2.7.0 SpringBoot Annotation mode
```
@SpringBootApplication
@DubboComponentScan
public class SpringBootProvider {
  public static void main(String[] args) {
    new EmbeddedZooKeeper(2181, false).start();
    SpringApplication.run(SpringBootProvider.class);
  }
}
```

2. set parameters as 2.5.10 for the ServiceBean.
```
@Service(parameters = {"key","value"})
public class DemoServiceImpl implements DemoService {

}
```
3. run SpringBootProvider to start the service

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

The service has been started and register to zookeeper.

### Actual Result

It throws exception as below, service cannot be started up.

```
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String[]' to required type 'java.util.Map' for property 'parameters'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String[]' to required type 'java.util.Map' for property 'parameters': no matching editors or conversion strategy found
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:591) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:603) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:216) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1532) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1491) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1231) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:551) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	... 15 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String[]' to required type 'java.util.Map' for property 'parameters': no matching editors or conversion strategy found
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:306) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:576) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:603) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:216) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1532) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1491) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1231) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:551) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	... 15 more
```

With my investigation, ConstructorArgValue discard in ServiceAnnotationBeanPostProcessor, which caused the issue. 
```
private AbstractBeanDefinition buildServiceBeanDefinition(Service service, Class<?> interfaceClass,
                                                              String annotatedServiceBeanName) {

        BeanDefinitionBuilder builder = rootBeanDefinition(ServiceBean.class)
                .addConstructorArgValue(service)
                // References "ref" property to annotated-@Service Bean
                .addPropertyReference("ref", annotatedServiceBeanName)
                .addPropertyValue("interface", interfaceClass.getName());
}
```
*
     * @param packagesToScan The base packages to scan
     * @param registry       {@link BeanDefinitionRegistry}
     */
    private void registerServiceBeans(Set<String> packagesToScan, BeanDefinitionRegistry registry) {
        DubboClassPathBeanDefinitionScanner scanner =
                new DubboClassPathBeanDefinitionScanner(registry, environment, resourceLoader);
        BeanNameGenerator beanNameGenerator = resolveBeanNameGenerator(registry);
        scanner.setBeanNameGenerator(beanNameGenerator);
        scanner.addIncludeFilter(new AnnotationTypeFilter(Service.class));
        for (String packageToScan : packagesToScan) {
            
            scanner.scan(packageToScan);
            
            Set<BeanDefinitionHolder> beanDefinitionHolders =
                    findServiceBeanDefinitionHolders(scanner, packageToScan, registry, beanNameGenerator);
            if (!CollectionUtils.isEmpty(beanDefinitionHolders)) {
                for (BeanDefinitionHolder beanDefinitionHolder : beanDefinitionHolders) {
                    registerServiceBean(beanDefinitionHolder, registry, scanner);
                }
                if (logger.isInfoEnabled()) {
                    logger.info(beanDefinitionHolders.size() + " annotated Dubbo's @Service Components { " +
                            beanDefinitionHolders +
                            " } were scanned under package[" + packageToScan + "]");
                }
            } else {
                if (logger.isWarnEnabled()) {
                    logger.warn("No Spring Bean annotating Dubbo's @Service was found under package["
                            + packageToScan + "]");
                }