【Don't merge . It will be split into multiple PRS】Enhance the support for http2 on both the client and server sides

[YvCeung]

• I have read the CONTRIBUTING.md guidelines.
• I have registered the PR changes.

Ⅰ. Describe what this PR did

1. 优化并统一了 HTTP 客户端工具类，实现对 h2c 协议的兼容与支持。
2. 在服务端补充了 watch 逻辑中对 HTTP/2 协议响应发送的支持。
3. 修复了 Http2HttpHandler 在解析 application/x-www-form-urlencoded 请求时可能导致解析失败的问题。

1.Enhanced and unified the HTTP client utility to support the h2c protocol.
2.Added support for sending responses over HTTP/2 within the server-side watch logic.
3.Fixed an issue in Http2HttpHandler where parsing requests with the application/x-www-form-urlencoded content type could fail.

Ⅱ. Does this pull request fix one issue?

fix #7732
fix #7712
fix #7685

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

It can be verified by observing the test cases of the integrated test case ClusterControllerTest

Ⅴ. Special notes for reviews

[YvCeung]

@funky-eyes @YongGoose PTAL

[codecov]

Codecov Report

❌ Patch coverage is 45.83333% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.66%. Comparing base (df7172d) to head (bb9db10).
⚠️ Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...a/org/apache/seata/common/util/HttpClientUtil.java	42.50%	38 Missing and 8 partials ⚠️
.../server/cluster/manager/ClusterWatcherManager.java	39.13%	11 Missing and 3 partials ⚠️
...he/seata/core/rpc/netty/http/Http2HttpHandler.java	66.66%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7736      +/-   ##
============================================
+ Coverage     63.64%   63.66%   +0.02%     
  Complexity      990      990              
============================================
  Files          1324     1323       -1     
  Lines         50125    50155      +30     
  Branches       5920     5928       +8     
============================================
+ Hits          31901    31932      +31     
+ Misses        15386    15376      -10     
- Partials       2838     2847       +9     

Files with missing lines	Coverage Δ
...he/seata/core/protocol/detector/Http2Detector.java	82.14% <ø> (+35.71%)	⬆️
...rpc/netty/http/filter/HttpRequestParamWrapper.java	77.98% <100.00%> (+24.27%)	⬆️
...initializer/db/SqlServerResourceIdInitializer.java	78.57% <ø> (ø)
...he/seata/core/rpc/netty/http/Http2HttpHandler.java	67.79% <66.66%> (+3.64%)	⬆️
.../server/cluster/manager/ClusterWatcherManager.java	68.18% <39.13%> (-4.37%)	⬇️
...a/org/apache/seata/common/util/HttpClientUtil.java	43.18% <42.50%> (+1.27%)	⬆️

... and 10 files with indirect coverage changes

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[Copilot]

Pull Request Overview

This PR enhances HTTP/2 protocol support across both client and server components of the Seata system. The changes include unifying the HTTP client utility to support h2c (HTTP/2 cleartext) protocol, adding HTTP/2 response handling in the server-side watch logic, and fixing a parsing issue for form-urlencoded requests in the HTTP/2 handler.

Key Changes:

• Unified HTTP client utilities by consolidating Http5ClientUtil functionality into HttpClientUtil with HTTP/2 support
• Added HTTP/2 response handling in ClusterWatcherManager for watch operations
• Fixed Http2HttpHandler to properly parse application/x-www-form-urlencoded request bodies

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
common/src/main/java/org/apache/seata/common/util/HttpClientUtil.java	Added HTTP/2 client methods using OkHttp with h2c protocol support
common/src/main/java/org/apache/seata/common/util/Http5ClientUtil.java	Removed (functionality merged into HttpClientUtil)
core/src/main/java/org/apache/seata/core/rpc/netty/http/Http2HttpHandler.java	Enhanced to parse both JSON and form-urlencoded request bodies
server/src/main/java/org/apache/seata/server/cluster/manager/ClusterWatcherManager.java	Added HTTP/2 response sending logic for watch operations
server/src/test/java/org/apache/seata/server/controller/ClusterControllerTest.java	Added HTTP/2-specific test cases for watch and XSS filter functionality
common/pom.xml	Changed okhttp dependency scope to provided
Multiple pom.xml files	Added okhttp dependencies where needed

Comments suppressed due to low confidence (1)

server/src/main/java/org/apache/seata/server/cluster/manager/ClusterWatcherManager.java:1

• The HTTP/1.1 response handling duplicates ctx.writeAndFlush(response) in both the if and else branches. Consider simplifying by removing the conditional logic since the only difference is setting the keep-alive header, which doesn't affect the flush operation.

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[Copilot]

Form parameter values are not URL-decoded. When parsing 'application/x-www-form-urlencoded' data, values must be decoded using URLDecoder.decode() to properly handle special characters and encoded spaces.