Add LogPatternTool (#413)

[qianheng-aws]

Description

Backport/backport 413 to 2.x

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[codecov]

Codecov Report

Attention: Patch coverage is 40.98361% with 72 lines in your changes missing coverage. Please review.

Project coverage is 77.67%. Comparing base (3cbb1f4) to head (3aa759d).
Report is 6 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...ava/org/opensearch/agent/tools/LogPatternTool.java	41.52%	62 Missing and 7 partials ⚠️
src/main/java/org/opensearch/agent/ToolPlugin.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #418      +/-   ##
============================================
- Coverage     81.63%   77.67%   -3.97%     
- Complexity      221      235      +14     
============================================
  Files            13       14       +1     
  Lines          1122     1241     +119     
  Branches        161      179      +18     
============================================
+ Hits            916      964      +48     
- Misses          144      208      +64     
- Partials         62       69       +7     

Flag	Coverage Δ
	77.67% <40.98%> (?)

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