keyspace: Pre alloc keyspace

[AmoebaProtozoa]

What problem does this PR solve?

Issue Number: Ref #5293

Addes config

[keyspaces]
pre-alloc = ["admin", "user1", "user2"]

to support pre-allocation of keyspace at pd bootstrap. With this, user can conveniently create a multi-tenant tidb cluster via tiup, instead of bootstrapping a pd cluster first and create keyspaces with http request before starting tidb.

What is changed and how does it work?

Check List

Tests

• Manual test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• JmPotato
• rleungx

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[ti-chi-bot]

Hi @AmoebaProtozoa. Thanks for your PR.

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[codecov]

Codecov Report

Base: 75.61% // Head: 75.35% // Decreases project coverage by -0.25% ⚠️

Coverage data is based on head (5d759b7) compared to base (fda03e5).
Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5869      +/-   ##
==========================================
- Coverage   75.61%   75.35%   -0.26%     
==========================================
  Files         337      337              
  Lines       34134    34143       +9     
==========================================
- Hits        25809    25730      -79     
- Misses       6114     6199      +85     
- Partials     2211     2214       +3     

Flag	Coverage Δ
unittests	75.35% <80.00%> (-0.26%)	⬇️

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

Impacted Files	Coverage Δ
server/config/config.go	78.71% <ø> (ø)
server/keyspace/keyspace.go	69.36% <77.77%> (+0.33%)	⬆️
server/server.go	75.00% <100.00%> (ø)
pkg/dashboard/keyvisual/input/core.go	0.00% <0.00%> (-33.34%)	⬇️
server/api/diagnostic.go	76.92% <0.00%> (-23.08%)	⬇️
pkg/id/id.go	83.05% <0.00%> (-6.78%)	⬇️
server/tso/local_allocator.go	62.16% <0.00%> (-6.76%)	⬇️
server/tso/allocator_manager.go	58.70% <0.00%> (-5.00%)	⬇️
pkg/storage/endpoint/meta.go	63.63% <0.00%> (-4.55%)	⬇️
server/region_syncer/server.go	82.96% <0.00%> (-4.40%)	⬇️
... and 27 more

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[ti-chi-bot]

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[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: 5d759b7

[HuSharp]

/test build

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@HuSharp: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test build

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[rleungx]

/ok-to-test