resource control: add priority field for resource group

[Connor1996]

What problem does this PR solve?

Issue Number: Close #6179

What is changed and how does it work?

Add priority field for resource group

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• JmPotato
• nolouch

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[nolouch]

lgtm

[Connor1996]

/merge

[ti-chi-bot]

@Connor1996: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: cd7c29d

[Connor1996]

/merge

[ti-chi-bot]

@Connor1996: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ba578da

[codecov]

Codecov Report

Patch coverage: 81.81% and project coverage change: +0.02 🎉

Comparison is base (7a0ce10) 74.46% compared to head (ba578da) 74.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6180      +/-   ##
==========================================
+ Coverage   74.46%   74.49%   +0.02%     
==========================================
  Files         393      393              
  Lines       38519    38527       +8     
==========================================
+ Hits        28685    28699      +14     
  Misses       7288     7288              
+ Partials     2546     2540       -6     

Flag	Coverage Δ
unittests	74.49% <81.81%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/mcs/resource_manager/server/resource_group.go	70.37% <71.42%> (-1.29%)	⬇️
pkg/mcs/resource_manager/server/server.go	59.22% <100.00%> (ø)
pkg/mcs/tso/server/server.go	51.46% <100.00%> (ø)
server/grpc_service.go	51.90% <100.00%> (+0.22%)	⬆️
server/server.go	75.27% <100.00%> (+0.73%)	⬆️
tests/cluster.go	79.80% <100.00%> (ø)

... and 22 files with indirect coverage changes

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