Add STR_TO_DATE Function To The SQL Plugin

[GabeFernandez310]

Description

Adds the str_to_date function to the SQL plugin. The function takes two arguments, an input string and a format string. The format string contains string format specifiers which describe how the characters in the input string are parsed to a DATETIME. Based off of MySQL, but differs in some areas due to the limitations of the plugin and Java's built-in DatetimeFormatter. Specifically, the format string used must exactly match the string being parsed, and any dates/times with 0 for the year/month/day will return NULL since these fields must be valid for Java LocalDate/LocalTime/LocalDatetime. The arguments must have enough information to build a DATE, TIME, or DATETIME.

Example:
SELECT str_to_date("May 1, 2013", "%M %d, %Y") -> 2013-05-01 00:00:00
SELECT str_to_date("9,23,11", "%h,%i,%s") -> 0001-01-01 09:23:11

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

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 #1420 (f21517e) into main (6496692) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##               main    #1420      +/-   ##
============================================
+ Coverage     98.39%   98.41%   +0.01%     
- Complexity     3716     3741      +25     
============================================
  Files           343      343              
  Lines          9160     9246      +86     
  Branches        582      596      +14     
============================================
+ Hits           9013     9099      +86     
  Misses          142      142              
  Partials          5        5              

Flag	Coverage Δ
sql-engine	98.41% <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)
...sql/expression/datetime/DateTimeFormatterUtil.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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[acarbonetto]

LGTM

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-1420-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 40336d4dd38bbd015564e03e4b16429b59c6412f
# Push it to GitHub
git push --set-upstream origin backport/backport-1420-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-1420-to-2.x.