*: refactor server entry point to support multi-mode service

[binshi-bing]

Signed-off-by: Bin Shi binshi.bing@gmail.com

What problem does this PR solve?

Issue Number: Ref #5836

What is changed and how does it work?

A service in different mode has different config struct and initialization logic, so we need to abstract an interface to create server.

A service in different mode has different config struct and initialization logic, so we need to abstract an interface to create server.

Check List

Tests

• Manual test (add detailed scripts or steps below)
  I did some compatibility test manually by verifying that the all-in-one pd-server can start normally w/o and w/ parameter.

Related changes

None.

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• rleungx

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[ti-chi-bot]

Hi @binshi-bing. Thanks for your PR.

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[binshi-bing]

This pr is split from #5917 to unblock #5858 by @lhy1024

[codecov]

Codecov Report

Base: 75.44% // Head: 75.31% // Decreases project coverage by -0.14% ⚠️

Coverage data is based on head (58a7b1f) compared to base (77d7be0).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5921      +/-   ##
==========================================
- Coverage   75.44%   75.31%   -0.14%     
==========================================
  Files         345      345              
  Lines       35126    35126              
==========================================
- Hits        26501    26454      -47     
- Misses       6325     6374      +49     
+ Partials     2300     2298       -2     

Flag	Coverage Δ
unittests	75.31% <ø> (-0.14%)	⬇️

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%)	⬇️
server/api/diagnostic.go	76.92% <0.00%> (-23.08%)	⬇️
pkg/tso/allocator_manager.go	59.51% <0.00%> (-4.52%)	⬇️
server/cluster/diagnostic_manager.go	72.04% <0.00%> (-4.31%)	⬇️
server/region_syncer/client.go	79.85% <0.00%> (-3.74%)	⬇️
pkg/election/leadership.go	77.31% <0.00%> (-3.10%)	⬇️
pkg/election/lease.go	84.05% <0.00%> (-2.90%)	⬇️
pkg/tso/local_allocator.go	62.16% <0.00%> (-2.71%)	⬇️
server/schedulers/shuffle_hot_region.go	55.12% <0.00%> (-2.57%)	⬇️
server/schedule/labeler/labeler.go	76.77% <0.00%> (-1.30%)	⬇️
... and 21 more

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[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: 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: 58a7b1f

[lhy1024]

/rebuild

[lhy1024]

/test build

[purelind]

/test build

[wuhuizuo]

/ok-to-test

[ti-chi-bot]

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

In response to this:

/ok-to-test

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