planner: refactor a few code of plan cache

[qw4990]

What problem does this PR solve?

Issue Number: ref #54057

Problem Summary: planner: refactor a few code of plan cache

What changed and how does it work?

1. unify the types of plan cache key/val/opts to use string/any/any;
2. remove the unnecessary structure planCacheKey;
3. move PlanCacheOpts into planner pacakge;

before:
  187170              6278 ns/op

after:
  191814              6223 ns/op

No regression

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

[tiprow]

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[codecov]

Codecov Report

Attention: Patch coverage is 90.76923% with 6 lines in your changes missing coverage. Please review.

Project coverage is 55.7451%. Comparing base (8f56847) to head (a1353da).
Report is 2 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54075         +/-   ##
=================================================
- Coverage   72.6029%   55.7451%   -16.8579%     
=================================================
  Files          1516       1636        +120     
  Lines        434689     605366     +170677     
=================================================
+ Hits         315597     337462      +21865     
- Misses        99623     244741     +145118     
- Partials      19469      23163       +3694     

Flag	Coverage Δ
integration	36.4575% <87.6923%> (?)
unit	71.5159% <90.7692%> (-0.0777%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	50.5444% <ø> (+8.2429%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [AilinKid,hawkingrei]
• pkg/planner/OWNERS [AilinKid,hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-18 05:49:27.393161759 +0000 UTC m=+93893.878650592: ☑️ agreed by hawkingrei.
• 2024-06-18 06:25:34.694679093 +0000 UTC m=+96061.180167926: ☑️ agreed by AilinKid.