feature: provide mock module

[l81893521]

Ⅰ. Describe what this PR did

Provide mock module for increase unit test coverage rate.

Ⅱ. Does this pull request fix one issue?

#1436

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1478 into develop will increase coverage by 0.16%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #1478      +/-   ##
=============================================
+ Coverage      46.26%   46.42%   +0.16%     
  Complexity      1714     1714              
=============================================
  Files            350      350              
  Lines          12802    12828      +26     
  Branches        1578     1615      +37     
=============================================
+ Hits            5923     5956      +33     
- Misses          6219     6224       +5     
+ Partials         660      648      -12

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/seata/server/session/GlobalSession.java	84.61% <0%> (-0.61%)	67% <0%> (ø)
...a/io/seata/core/rpc/netty/AbstractRpcRemoting.java	9.95% <0%> (-0.21%)	3% <0%> (ø)
...n/java/io/seata/rm/datasource/ConnectionProxy.java	9.09% <0%> (-0.11%)	4% <0%> (ø)
...tobuf/convertor/BranchCommitResponseConvertor.java	97.43% <0%> (+0.06%)	3% <0%> (ø)	⬇️
...in/java/io/seata/server/session/BranchSession.java	78.19% <0%> (+0.07%)	41% <0%> (ø)	⬇️
...buf/convertor/BranchRollbackResponseConvertor.java	97.36% <0%> (+0.07%)	3% <0%> (ø)	⬇️
...tobuf/convertor/GlobalCommitResponseConvertor.java	97.05% <0%> (+0.08%)	3% <0%> (ø)	⬇️
...buf/convertor/GlobalRollbackResponseConvertor.java	97.05% <0%> (+0.08%)	3% <0%> (ø)	⬇️
...tobuf/convertor/GlobalStatusResponseConvertor.java	97.05% <0%> (+0.08%)	3% <0%> (ø)	⬇️
...uf/convertor/GlobalLockQueryResponseConvertor.java	96.42% <0%> (+0.13%)	3% <0%> (ø)	⬇️
... and 15 more

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[slievrly]

LGTM

[xingfudeshi]

LGTM.