### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When creating base-path-mappings on an API Gateway, there is a special `(none)` path when you don't specify a path during creation. Localstack stores this as `basePath: "(none)"` internally.
When you query to get the base paths, the URLs are escaped by the client (verified in both awscli and terraform) so the basePath is sent as `%28none%29` in the url.
Localstack doesn't appear to be decoding urls and when you attempt to get-base-path-mapping it fails in a string comparison of `(none)` to `%28none%29`.

```shell
> aws --endpoint-url=http://localhost:4566 apigateway get-base-path-mapping --domain-name example.com --base-path "(none)"

An error occurred (NotFoundException) when calling the GetBasePathMapping operation: Base path mapping not found: %28none%29
```

### Expected Behavior

When you attempt to get-base-path-mappings after creating one with the (none) path, it succeeds and returns the mapping.

```
> aws --endpoint-url=http://localhost:4566 apigateway get-base-path-mapping --domain-name example.com --base-path "(none)"

{
    "basePath": "(none)",
    "restApiId": "uyy4c3dsho",
    "stage": "dev"
}
```


### How are you starting LocalStack?

With the `localstack` script

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    make start

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

    awslocal apigateway create-rest-api --name "testgw"
    awslocal apigateway create-base-path-mapping --domain-name example.com --rest-api-id <from output above> --stage dev
    awslocal apigateway get-base-path-mapping --domain-name example.com --base-path "(none)"



### Environment

```markdown
- OS: fedora 34
- LocalStack: latest
```


### Anything else?

https://docs.aws.amazon.com/apigateway/api-reference/link-relation/basepathmapping-by-base-path/
matches = []
    for api_path, details in path_map.items():
        api_path_regex = re.sub(r"\{[^\+]+\+\}", r"[^\?#]+", api_path)
        api_path_regex = re.sub(r"\{[^\}]+\}", r"[^/]+", api_path_regex)
        if re.match(r"^%s$" % api_path_regex, path):
            matches.append((api_path, details))
    if not matches:
        return None
    if len(matches) > 1:
        
        for match in matches:
            if match[0] == path:
                return match
            if path_matches_pattern(path, match[0]):
                return match
        raise Exception("Ambiguous API path %s - matches found: %s" % (path, matches))
    return matches[0]
def path_matches_pattern(path, api_path):
    api_paths = api_path.split("/")
    paths = path.split("/")
    reg_check = re.compile(r"\{(.*)\}")
    results = []
    if len(api_paths) != len(paths):
        return False
    for indx, part in enumerate(api_paths):
        if reg_check.match(part) is None and part:
            results.append(part == paths[indx])
    return len(results) > 0 and all(results)
def connect_api_gateway_to_sqs(gateway_name, stage_name, queue_arn, path, region_name=None):