[Backport 2.x] Add last_day Function To OpenSearch SQL Plugin

[opensearch-trigger-bot]

Backport d9114f5 from #1344

[codecov-commenter]

Codecov Report

Merging #1350 (3839763) into 2.x (46026af) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@            Coverage Diff            @@
##                2.x    #1350   +/-   ##
=========================================
  Coverage     98.38%   98.38%           
- Complexity     3692     3698    +6     
=========================================
  Files           345      345           
  Lines          9098     9115   +17     
  Branches        585      585           
=========================================
+ Hits           8951     8968   +17     
  Misses          142      142           
  Partials          5        5           

Flag	Coverage Δ
sql-engine	98.38% <100.00%> (+<0.01%)	⬆️

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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)

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