[3.0] Add KeyAffinityExecutor

[EarthChen]

What is the purpose of the change

• add KeyAffinityExecutor for stream scenario (Because a stream can contain multiple user methods, they need to run sequentially in one thread)

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #8975 (f6b8a50) into 3.0 (403a989) will decrease coverage by 0.38%.
The diff coverage is 72.56%.

@@             Coverage Diff              @@
##                3.0    #8975      +/-   ##
============================================
- Coverage     63.71%   63.32%   -0.39%     
+ Complexity      315      312       -3     
============================================
  Files          1183     1191       +8     
  Lines         50270    50407     +137     
  Branches       7525     7536      +11     
============================================
- Hits          32029    31920     -109     
- Misses        14747    14988     +241     
- Partials       3494     3499       +5     

Impacted Files	Coverage Δ
...readpool/affinity/AbstractKeyAffinityExecutor.java	55.81% <55.81%> (ø)
...mmon/threadpool/affinity/MinActiveKeyAffinity.java	63.63% <63.63%> (ø)
...ommon/threadpool/affinity/AbstractKeyAffinity.java	83.33% <83.33%> (ø)
.../dubbo/common/threadpool/affinity/KeyAffinity.java	100.00% <100.00%> (ø)
...eadpool/affinity/MinActiveKeyAffinityExecutor.java	100.00% <100.00%> (ø)
.../common/threadpool/affinity/RandomKeyAffinity.java	100.00% <100.00%> (ø)
...threadpool/affinity/RandomKeyAffinityExecutor.java	100.00% <100.00%> (ø)
.../threadpool/manager/DefaultExecutorRepository.java	67.39% <100.00%> (ø)
...figcenter/file/FileSystemDynamicConfiguration.java	0.00% <0.00%> (-57.21%)	⬇️
...fig/configcenter/TreePathDynamicConfiguration.java	60.00% <0.00%> (-25.72%)	⬇️
... and 38 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 403a989...f6b8a50. Read the comment docs.

[EarthChen]

use #8999 replace this