[GitHub] [dubbo] LinShunKang opened pull request #5428: [Dubbo-Optimize] Simple optimize

["LinShunKang (GitHub)" <gi...@apache.org>]

## What is the purpose of the change

* Reduce object allocation:
   - Reduce `Iterator` instance allocation when get `MethodDescriptor` in `ServiceDescriptor`.
   - Reduce `StringBuilder` instance allocation  and memory copy in `DecodeableRpcResult.decode()` and `DubboMonitor.send()`.

* Optimizing `String` usage for `URL` and `UrlUtils`.

## Brief changelog

* Use `Map<String, List<MethodDescriptor>>` rather than `Map<String, Set<MethodDescriptor>>` to store `methods`
* Add `Logger.isDebugEnabled()` before invoke `Logger.debug()` in `DecodeableRpcResult.decode()`
* Use `String.indexOf(char)` instead of `String.indexOf(String)` for single character string.
* Use `String.indexOf(char)` instead of `String.contains(String)` for single character string.

## Verifying this change

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[ Full content available at: https://github.com/apache/dubbo/pull/5428 ]
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