enhance: add privilege group message types and corresponding tests

[SimFG]

• issue: [Enhancement]: Support to replicate privilege group apis #41938

[mergify]

@SimFG go-sdk check failed, comment rerun go-sdk can trigger the job again.

[mergify]

@SimFG E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

Attention: Patch coverage is 82.90598% with 20 lines in your changes missing coverage. Please review.

Project coverage is 80.58%. Comparing base (65dd398) to head (48da752).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/mq/msgstream/msg_for_user_role.go	79.16%	14 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #41939       +/-   ##
===========================================
+ Coverage   73.64%   80.58%    +6.94%     
===========================================
  Files         335     1528     +1193     
  Lines       30692   216108   +185416     
===========================================
+ Hits        22603   174153   +151550     
- Misses       8089    35727    +27638     
- Partials        0     6228     +6228     

Components	Coverage Δ
Client	79.36% <ø> (∅)
Core	73.64% <ø> (ø)
Go	81.97% <82.90%> (∅)

Files with missing lines	Coverage Δ
internal/proxy/util.go	85.84% <100.00%> (ø)
pkg/mq/msgstream/unmarshal.go	100.00% <100.00%> (ø)
pkg/mq/msgstream/msg_for_user_role.go	80.11% <79.16%> (ø)

... and 1190 files with indirect coverage changes

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[SimFG]

/run-cpu-e2e

[czs007]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, SimFG

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Needs approval from an approver in each of these files:

• internal/proxy/OWNERS [czs007]
• pkg/mq/msgstream/OWNERS [czs007]

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