一点关于UrlCleaner的改进建议和意见

这里，UrlCleaner特指sentinel-spring-webmvc-adapter中的UrlCleaner：
https://github.com/alibaba/Sentinel/blob/master/sentinel-adapter/sentinel-spring-webmvc-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/spring/webmvc/callback/UrlCleaner.java

个人认为有两点值得改进：

* UrlCleaner名称词不达意。UrlCleaner重写的不是Url，而是资源名称，叫ResourceNameRewiter或许更加贴切。

* 目前UrlCleaner提供的参数较少，能定制的空间很小。目前只能在原资源名称的基础上改写资源。但实际业务中，往往需要根据具体的请求重写资源名称。因此，加上 `HttpServletRequest` 的参数灵活性会好很多。

Start with sentinel-adapter/sentinel-spring-webmvc-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/spring/webmvc/callback/UrlCleaner.java and inspect its callers and public callback usage. Evaluate the proposed resource-name rename and HttpServletRequest parameter, including compatibility implications; done means the API supports request-based rewriting and the naming accurately reflects its purpose.

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