Add Day_Of_Month Function As An Alias Of DayOfMonth

[GabeFernandez310]

Description

Adds support for the day_of_month function as an alias for the dayofmonth function which currently exists in opensearch

Issues Resolved

#722

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #1227 (1f225c6) into main (6e72f18) will decrease coverage by 2.44%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1227      +/-   ##
============================================
- Coverage     98.35%   95.91%   -2.45%     
- Complexity     3601     3604       +3     
============================================
  Files           344      354      +10     
  Lines          8926     9591     +665     
  Branches        562      681     +119     
============================================
+ Hits           8779     9199     +420     
- Misses          142      334     +192     
- Partials          5       58      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.35% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...c/main/java/org/opensearch/sql/expression/DSL.java	100.00% <100.00%> (ø)
...arch/sql/expression/datetime/DateTimeFunction.java	100.00% <100.00%> (ø)
...h/sql/expression/function/BuiltinFunctionName.java	100.00% <100.00%> (ø)
...ublic/components/QueryResults/QueryResultsBody.tsx	68.32% <0.00%> (ø)
workbench/public/components/app.tsx	0.00% <0.00%> (ø)
workbench/public/components/Header/Header.tsx	100.00% <0.00%> (ø)
workbench/public/components/PPLPage/PPLPage.tsx	56.52% <0.00%> (ø)
workbench/public/components/SQLPage/SQLPage.tsx	100.00% <0.00%> (ø)
workbench/public/utils/PanelWrapper.tsx	100.00% <0.00%> (ø)
...ch/public/components/QueryResults/QueryResults.tsx	61.60% <0.00%> (ø)
... and 3 more

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[dai-chen]

Thanks for the changes!