Added RINT function to V2 engine

[matthewryanwells]

Description

Added math function RINT to V2 engine, updated documentation, and added unit/IT tests. Additionally fixed small typo in the EXPM1 description

Issues Resolved

#1190

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #1433 (39a9214) into main (98fb969) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##               main    #1433      +/-   ##
============================================
- Coverage     98.38%   98.38%   -0.01%     
  Complexity     3698     3698              
============================================
  Files           343      343              
  Lines          9121     9118       -3     
  Branches        586      582       -4     
============================================
- Hits           8974     8971       -3     
  Misses          142      142              
  Partials          5        5              

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

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

Impacted Files	Coverage Δ
...ain/java/org/opensearch/sql/analysis/Analyzer.java	100.00% <100.00%> (ø)
...c/main/java/org/opensearch/sql/expression/DSL.java	100.00% <100.00%> (ø)
...h/sql/expression/function/BuiltinFunctionName.java	100.00% <100.00%> (ø)
...expression/function/BuiltinFunctionRepository.java	100.00% <100.00%> (ø)
...ssion/operator/arthmetic/MathematicalFunction.java	100.00% <100.00%> (ø)

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