[Backport 2.4] Add function name as identifier in antlr

[opensearch-trigger-bot]

Backport 2938890 from #1015

[codecov-commenter]

Codecov Report

Merging #1018 (f0bbb7b) into 2.4 (3e17e23) will decrease coverage by 2.63%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.4    #1018      +/-   ##
============================================
- Coverage     98.22%   95.58%   -2.64%     
+ Complexity     3272     3268       -4     
============================================
  Files           314      324      +10     
  Lines          8205     8855     +650     
  Branches        535      652     +117     
============================================
+ Hits           8059     8464     +405     
- Misses          142      334     +192     
- Partials          4       57      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.21% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...pensearch/sql/ppl/parser/AstExpressionBuilder.java	100.00% <100.00%> (ø)
...pensearch/sql/sql/parser/AstExpressionBuilder.java	100.00% <100.00%> (ø)
workbench/public/components/Header/Header.tsx	100.00% <0.00%> (ø)
workbench/public/application.tsx	0.00% <0.00%> (ø)
...h/public/components/QueryLanguageSwitch/Switch.tsx	85.71% <0.00%> (ø)
...ch/public/components/QueryResults/QueryResults.tsx	61.60% <0.00%> (ø)
workbench/public/components/SQLPage/SQLPage.tsx	100.00% <0.00%> (ø)
workbench/public/components/app.tsx	0.00% <0.00%> (ø)
workbench/public/utils/PanelWrapper.tsx	100.00% <0.00%> (ø)
...ublic/components/QueryResults/QueryResultsBody.tsx	68.32% <0.00%> (ø)
... and 2 more

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