resource_manager: introduce the resource unit model and config

[JmPotato]

Signed-off-by: JmPotato ghzpotato@gmail.com

What problem does this PR solve?

Issue Number: ref #5851.

What is changed and how does it work?

Introduce the resource unit (RU) model and related config.

Check List

Tests

• Unit test
• Integration test

Related changes

• This PR is split from resouce_manager: impl resource controller for tokens client #5811.

Release note

None.

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• CabinfeverB
• nolouch

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[codecov]

Codecov Report

Base: 75.62% // Head: 75.43% // Decreases project coverage by -0.19% ⚠️

Coverage data is based on head (7af80a8) compared to base (5573d67).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5862      +/-   ##
==========================================
- Coverage   75.62%   75.43%   -0.20%     
==========================================
  Files         337      337              
  Lines       34129    34129              
==========================================
- Hits        25810    25745      -65     
- Misses       6111     6158      +47     
- Partials     2208     2226      +18     

Flag	Coverage Δ
unittests	75.43% <ø> (-0.20%)	⬇️

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

Impacted Files	Coverage Δ
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
pkg/id/id.go	83.05% <0.00%> (-10.17%)	⬇️
pkg/dashboard/adapter/manager.go	75.86% <0.00%> (-5.75%)	⬇️
server/region_syncer/server.go	81.86% <0.00%> (-5.50%)	⬇️
pkg/election/leadership.go	76.28% <0.00%> (-4.13%)	⬇️
pkg/member/member.go	62.10% <0.00%> (-3.69%)	⬇️
server/tso/allocator_manager.go	64.19% <0.00%> (-3.55%)	⬇️
pkg/storage/kv/etcd_kv.go	72.22% <0.00%> (-3.18%)	⬇️
pkg/utils/etcdutil/etcdutil.go	82.55% <0.00%> (-2.33%)	⬇️
server/schedule/labeler/rules.go	87.50% <0.00%> (-2.28%)	⬇️
... and 15 more

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[nolouch]

lgtm.

[nolouch]

is it too high?

[JmPotato]

Make sense. Let's keep it a smaller value first. We can adjust it after some tests.

[JmPotato]

/merge

[ti-chi-bot]

@JmPotato: 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: e48b2fc

[ti-chi-bot]

@JmPotato: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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