pkg/autoid_service: add lock to make API thread-safe (#50820)

[ti-chi-bot]

This is an automated cherry-pick of #50820

What problem does this PR solve?

Issue Number: close #50819

Problem Summary:

What changed and how does it work?

The exposed API should be thread-safe, and forceRebase allocAutoID alloc4Unsigned alloc4Signed ... all those internal functions should be called under lock.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.1@2a0d877). Click here to learn what that means.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #51322   +/-   ##
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  Coverage               ?   73.4014%           
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  Files                  ?       1210           
  Lines                  ?     378987           
  Branches               ?          0           
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  Hits                   ?     278182           
  Misses                 ?      83031           
  Partials               ?      17774           

[bb7133]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-27 10:08:13.725753783 +0000 UTC m=+956582.473376888: ☑️ agreed by hawkingrei.
• 2024-02-27 10:14:34.511351961 +0000 UTC m=+956963.258975097: ☑️ agreed by bb7133.