[schedulers]: get stores only once

[bufferflies]

Signed-off-by: bufferflies 1045931706@qq.com

What problem does this PR solve?

related #3744, Get stores only once to reduce scheduler execute time

What is changed and how it works?

stores should get once before schedule and it should input to plan

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

Code changes

Side effects

Related changes

Release note

balance leader and balance region scheduler should calculator get Stores only once  to improve balance  performance

[ti-chi-bot]

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• lhy1024

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[codecov]

Codecov Report

Merging #4003 (eab1ff5) into master (ccc8bcd) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4003      +/-   ##
==========================================
- Coverage   74.61%   74.49%   -0.12%     
==========================================
  Files         254      255       +1     
  Lines       25826    25831       +5     
==========================================
- Hits        19269    19243      -26     
- Misses       4847     4867      +20     
- Partials     1710     1721      +11     

Flag	Coverage Δ
unittests	74.49% <100.00%> (-0.12%)	⬇️

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

Impacted Files	Coverage Δ
server/cluster/coordinator.go	73.64% <100.00%> (+0.05%)	⬆️
server/schedule/opt/opts.go	100.00% <100.00%> (ø)
server/tso/tso.go	62.43% <0.00%> (-5.53%)	⬇️
server/region_syncer/client.go	77.46% <0.00%> (-4.23%)	⬇️
server/statistics/hot_cache_task.go	75.00% <0.00%> (-4.17%)	⬇️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/schedulers/random_merge.go	60.00% <0.00%> (-3.34%)	⬇️
server/server.go	70.51% <0.00%> (-1.52%)	⬇️
server/member/member.go	65.24% <0.00%> (-1.07%)	⬇️
server/cluster/cluster.go	82.22% <0.00%> (-0.83%)	⬇️
... and 11 more

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[HunDunDM]

rest LGTM

[HunDunDM]

Please fix the test

[nolouch]

/merge

[ti-chi-bot]

@nolouch: 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: eab1ff5