enhance: simplify ANTLR grammar definitions

[tedxu]

See #36672

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Report is 399 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #36811   +/-   ##
=========================================
  Coverage          ?   72.45%           
=========================================
  Files             ?     1308           
  Lines             ?   155818           
  Branches          ?        0           
=========================================
  Hits              ?   112891           
  Misses            ?    37814           
  Partials          ?     5113           

Files with missing lines	Coverage Δ
internal/parser/planparserv2/pool.go	92.30% <100.00%> (ø)

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