[LucaCappelletti94]

CREATE OPERATOR CLASS and ALTER OPERATOR FAMILY ... ADD OPERATOR share one private parser for optional FOR SEARCH and FOR ORDER BY clauses and their diagnostics.

Addresses the operator-purpose parsing duplication tracked in #2698.

Yet another echoes find.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 82.30%. Comparing base (49033b0) to head (d34dcb3).

Files with missing lines	Patch %	Lines
src/parser/mod.rs	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2719   +/-   ##
=======================================
  Coverage   82.29%   82.30%           
=======================================
  Files          42       42           
  Lines       35315    35311    -4     
  Branches    35315    35311    -4     
=======================================
  Hits        29061    29061           
+ Misses       2695     2692    -3     
+ Partials     3559     3558    -1     

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[LucaCappelletti94]

cc @alamb merging also this echo