support for observing metrics collected on seata client side

[robynron]

• [x] I have registered the PR changes.

Ⅰ. Describe what this PR did

Improved the monitoring of various data on the Seata Client side. Help users effectively monitor the execution process and identify possible problems.

Ⅱ. Does this pull request fix one issue?

fixes #4637

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

I'll add later.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[lgtm-com[bot]]

This pull request introduces 7 alerts when merging 77ad52705c08df47cec589ee5d756a8965ffd6c7 into 06c2a50473fd59deefd6cb42d01ffd095eef20a7 - view on LGTM.com

new alerts:

• 7 for Boxed variable is never null

[codecov-commenter]

Codecov Report

Merging #4878 (e44f6fe) into develop (06c2a50) will decrease coverage by 0.72%. The diff coverage is 43.20%.

:exclamation: Current head e44f6fe differs from pull request most recent head 3511fda. Consider uploading reports for the commit 3511fda to get more accurate results

@@              Coverage Diff              @@
##             develop    #4878      +/-   ##
=============================================
- Coverage      49.23%   48.50%   -0.73%     
+ Complexity      4117     4084      -33     
=============================================
  Files            737      740       +3     
  Lines          25827    26757     +930     
  Branches        3193     3191       -2     
=============================================
+ Hits           12715    12979     +264     
- Misses         11764    12433     +669     
+ Partials        1348     1345       -3     

Impacted Files	Coverage Δ
...c/main/java/io/seata/core/context/RootContext.java	44.61% <0.00%> (-2.16%)	:arrow_down:
...src/main/java/io/seata/core/event/BranchEvent.java	0.00% <0.00%> (ø)
...va/io/seata/core/event/GlobalTransactionEvent.java	0.00% <0.00%> (ø)
.../main/java/io/seata/rm/datasource/AsyncWorker.java	40.62% <0.00%> (-4.21%)	:arrow_down:
...java/io/seata/rm/datasource/DataSourceManager.java	22.22% <0.00%> (-2.17%)	:arrow_down:
...m/datasource/undo/oracle/OracleUndoLogManager.java	10.25% <0.00%> (-1.51%)	:arrow_down:
...urce/undo/postgresql/PostgresqlUndoLogManager.java	7.14% <0.00%> (-0.97%)	:arrow_down:
...configure/SeataServerEnvironmentPostProcessor.java	0.00% <ø> (ø)
...java/io/seata/server/metrics/MetricsPublisher.java	93.75% <ø> (ø)
...src/main/java/io/seata/rm/tcc/TCCFenceHandler.java	0.00% <0.00%> (ø)
... and 23 more

[CLAassistant]

All committers have signed the CLA.

[Bughue]

是不是要关联下 https://github.com/seata/seata/tree/develop/metrics#readme

[funky-eyes]

Due to code conflicts and age, if you are still interested in participating in the community, please resubmit this pr to the 2.x branch after resolving the conflict. 由于代码冲突以及年代久远，如果你还有兴趣参与到社区，请解决完冲突后重新请提交这份pr至2.x分支中

[robynron]

好的，我后面基于2.x分支重新弄一下