id: fix the id allocator is not monotonic (#3305)

[ti-srebot]

cherry-pick #3305 to release-5.0-rc

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What problem does this PR solve?

What is changed and how it works?

This PR tries to make the id monotonic since there are many components that depend on this property. ref: #3303

Check List

Tests

• Unit test

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tidb-ansible:
• Need to cherry-pick to the release branch

Release note

[ti-srebot]

@rleungx you're already a collaborator in bot's repo.

[codecov]

Codecov Report

Merging #3306 (c5e4260) into release-5.0-rc (9efcf3a) will decrease coverage by 0.12%.
The diff coverage is 42.85%.

@@                Coverage Diff                 @@
##           release-5.0-rc    #3306      +/-   ##
==================================================
- Coverage           74.23%   74.11%   -0.13%     
==================================================
  Files                 243      243              
  Lines               23083    23088       +5     
==================================================
- Hits                17136    17112      -24     
- Misses               4377     4398      +21     
- Partials             1570     1578       +8     

Flag	Coverage Δ
unittests	74.11% <42.85%> (-0.13%)	⬇️

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

Impacted Files	Coverage Δ
server/server.go	72.46% <0.00%> (-0.83%)	⬇️
server/id/id.go	76.19% <54.54%> (+1.19%)	⬆️
server/tso/local_allocator.go	63.63% <0.00%> (-15.16%)	⬇️
server/schedulers/random_merge.go	56.14% <0.00%> (-3.51%)	⬇️
server/tso/allocator_manager.go	75.80% <0.00%> (-2.22%)	⬇️
server/schedule/operator/step.go	67.44% <0.00%> (-1.67%)	⬇️
pkg/btree/btree.go	85.30% <0.00%> (-0.97%)	⬇️
server/config/persist_options.go	91.43% <0.00%> (-0.78%)	⬇️
server/grpc_service.go	56.16% <0.00%> (-0.69%)	⬇️
server/cluster/coordinator.go	69.52% <0.00%> (-0.48%)	⬇️
... and 9 more

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[HunDunDM]

This PR contains #3310

[nolouch]

/run-all-tests

[rleungx]

/run-unit-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

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/ti-community-prow repository.

[ti-chi-bot]

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

Commit hash: b95c001

[ti-chi-bot]

@ti-srebot: Your PR has out-of-dated, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/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/ti-community-prow repository.

[nolouch]

/run-integration-lightning-test