server: refactor params of askSplit call

[qingfeng777]

What problem does this PR solve?

Issue Number: Close #5014

What is changed and how does it work?

refactor params of askSplit call in grpc_service.go

Check List

Tests

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

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

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

Release note

None.

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[ti-chi-bot]

Hi @qingfeng777. Thanks for your PR.

I'm waiting for a tikv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[rleungx]

/ok-to-test

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.50%. Comparing base (6bf980d) to head (838f18c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8537      +/-   ##
==========================================
- Coverage   77.55%   77.50%   -0.05%     
==========================================
  Files         474      474              
  Lines       61861    61856       -5     
==========================================
- Hits        47974    47942      -32     
- Misses      10355    10373      +18     
- Partials     3532     3541       +9     

Flag	Coverage Δ
unittests	77.50% <0.00%> (-0.05%)	⬇️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HuSharp, rleungx

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• OWNERS [HuSharp,rleungx]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-21 01:58:48.557908892 +0000 UTC m=+317123.692359005: ☑️ agreed by rleungx.
• 2024-08-21 03:13:25.710992971 +0000 UTC m=+321600.845443092: ☑️ agreed by HuSharp.