reactor: reactor extensions module

[slievrly]

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

Ⅰ. Describe what this PR did

reactor extensions module

extensions/
├── pom.xml
├── rpc/
│ ├── pom.xml
│ ├── seata-rpc-core/
│ ├── seata-brpc/
│ ├── seata-dubbo/
│ ├── seata-dubbo-alibaba/
│ ├── seata-grpc/
│ ├── seata-hsf/
│ ├── seata-http/
│ ├── seata-http-jakarta/
│ ├── seata-motan/
│ └── seata-sofa-rpc/
├── apm/
│ ├── pom.xml
│ └── apm-seata-skywalking-plugin/
└── messaging/
├── pom.xml
└── seata-rocketmq/

Ⅱ. Does this pull request fix one issue?

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.39%. Comparing base (6614996) to head (4fb62b4).

Files with missing lines	Patch %	Lines
...arta/JakartaTransactionPropagationInterceptor.java	0.00%	19 Missing ⚠️
...integration/http/JakartaSeataWebMvcConfigurer.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7688      +/-   ##
============================================
- Coverage     61.40%   61.39%   -0.01%     
  Complexity      680      680              
============================================
  Files          1314     1313       -1     
  Lines         49890    49899       +9     
  Branches       5878     5881       +3     
============================================
+ Hits          30634    30637       +3     
- Misses        16469    16474       +5     
- Partials       2787     2788       +1     

Files with missing lines	Coverage Δ
...http/JakartaTransactionPropagationInterceptor.java	0.00% <ø> (ø)
...g/plugin/DefaultCoreDoGlobalCommitInterceptor.java	68.75% <ø> (ø)
...plugin/NettyRemotingClientSendSyncInterceptor.java	80.00% <ø> (ø)
...ng/plugin/RemotingProcessorProcessInterceptor.java	85.00% <ø> (ø)
...apm/skywalking/plugin/common/SWSeataConstants.java	95.65% <ø> (ø)
...ata/apm/skywalking/plugin/common/SWSeataUtils.java	77.27% <ø> (ø)
...pm/skywalking/plugin/common/SeataPluginConfig.java	25.00% <ø> (ø)
...n/define/AbstractNettyRemotingInstrumentation.java	26.31% <ø> (ø)
...king/plugin/define/DefaultCoreInstrumentation.java	23.07% <ø> (ø)
...lugin/define/RemotingProcessorInstrumentation.java	50.00% <ø> (ø)
... and 27 more

... and 7 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.