planner: add the variable PlanCacheMaxDecimalParamNums to restrict the number of decimal values in plan cache

[Reminiscent]

What problem does this PR solve?

Issue Number: ref #58576

Problem Summary:
Add an variable to control how many decimal values allowed in the plan cache.

What changed and how does it work?

We'll check the parameter's type. If the number of decimal values more than the settings. We'll skip the plan cache for this case

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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tiprow]

Hi @Reminiscent. Thanks for your PR.

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[Reminiscent]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.0030%. Comparing base (8b070c2) to head (0c5c13a).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #64306        +/-   ##
================================================
+ Coverage   72.7515%   73.0030%   +0.2515%     
================================================
  Files          1859       1861         +2     
  Lines        504182     506261      +2079     
================================================
+ Hits         366800     369586      +2786     
+ Misses       115122     114459       -663     
+ Partials      22260      22216        -44     

Flag	Coverage Δ
integration	41.8256% <100.0000%> (?)
unit	72.2880% <31.2500%> (-0.0345%)	⬇️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	45.4507% <ø> (-0.9029%)	⬇️

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[qw4990]

Should disable this by default to keep the same behavior.

[ti-chi-bot]

@Reminiscent: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/mysql-test	0c5c13a	link	true	/test mysql-test
pull-unit-test-next-gen	0c5c13a	link	true	/test pull-unit-test-next-gen

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[tiprow]

@Reminiscent: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	0c5c13a	link	true	/test fast_test_tiprow

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