enhance: optimize plan parser pool to avoid unnessary recycle

[xiaofan-luan]

fix #32868
plan parser takes too much cpu on high qps,this pr try to avoid create lexer and parser too freequent

[mergify]

@xiaofan-luan ut workflow job failed, comment rerun ut can trigger the job again.

[mergify]

@xiaofan-luan E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify]

@xiaofan-luan E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify]

@xiaofan-luan E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.73%. Comparing base (f7d2911) to head (ae239c1).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #32869      +/-   ##
==========================================
- Coverage   82.02%   81.73%   -0.30%     
==========================================
  Files        1006     1007       +1     
  Lines      127363   127623     +260     
==========================================
- Hits       104466   104308     -158     
- Misses      18923    19340     +417     
- Partials     3974     3975       +1     

Files	Coverage Δ
internal/parser/planparserv2/pool.go	100.00% <100.00%> (+13.33%)	⬆️

... and 42 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, xiaofan-luan

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[Yherealtita]

Approved