bugfix: fix memory leak in MySQL XA mode

[firmianaQ]

…ak in com.mysql.cj.jdbc.SuspendableXAConnection.XIDS_TO_PHYSICAL_CONNECTIONS

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

Ⅰ. Describe what this PR did

Override XABranchXid equals() and hashCode() to fix memory leak in com.mysql.cj.jdbc.SuspendableXAConnection.XIDS_TO_PHYSICAL_CONNECTIONS

Ⅱ. Does this pull request fix one issue?

fixes #7682

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 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.44%. Comparing base (06ec3fe) to head (c3be495).
⚠️ Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...org/apache/seata/rm/datasource/xa/XABranchXid.java	57.14%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7683      +/-   ##
============================================
+ Coverage     61.36%   61.44%   +0.08%     
- Complexity      680      684       +4     
============================================
  Files          1314     1314              
  Lines         49883    49890       +7     
  Branches       5876     5878       +2     
============================================
+ Hits          30611    30657      +46     
+ Misses        16484    16442      -42     
- Partials       2788     2791       +3     

Files with missing lines	Coverage Δ
...org/apache/seata/rm/datasource/xa/XABranchXid.java	68.18% <57.14%> (-2.09%)	⬇️

... and 10 files with indirect coverage changes

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[funky-eyes]

LGTM