### Environment

* Dubbo version: 2.7.3

### Steps to reproduce this issue
1. I see the TpsLimitFilter doc ,it describes can limit the TPS (transaction per second) for all method of a service or a particular method. but when I config like this 
```
    <dubbo:service interface="org.apache.dubbo.samples.basic.api.DemoService" ref="demoService">
        <dubbo:method name="sayHello" retries="21">
            <dubbo:parameter key="tps" value="45"/>
        </dubbo:method>
    </dubbo:service>
```
This config will generate the url key "sayHello.tps", it dosen't "tps" where the DefaultTPSLimiter use.
```
int rate = url.getParameter(TPS_LIMIT_RATE_KEY, -1);
```
So it will not limit for a particular method.

dubbo TpsLimitFilter   代码中文档描述说可以作用于指定方法上   但是TPSLimiter默认实现DefaultTPSLimiter只作用于 key=tps (也就是只作用于单个service上) 因为在方法上配置tps最终在URL中生成的是methodName.tps  各位大佬请教一下哇 @beiwei30 


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package org.apache.dubbo.rpc.filter.tps;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.support.MockInvocation;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import static org.apache.dubbo.common.constants.CommonConstants.INTERFACE_KEY;
import static org.apache.dubbo.rpc.Constants.TPS_LIMIT_INTERVAL_KEY;
import static org.apache.dubbo.rpc.Constants.TPS_LIMIT_RATE_KEY;
public class DefaultTPSLimiterTest {