Log pattern tool improvement

[songkant-aws]

Description

Improve log pattern tool with cutting edge log pattern parser by introducing Brain algorithm mentioned in this RFC: opensearch-project/OpenSearch#16627

Related Issues

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.

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]

Codecov Report

Attention: Patch coverage is 87.23404% with 30 lines in your changes missing coverage. Please review.

Project coverage is 82.11%. Comparing base (2b76e3c) to head (64837d7).
Report is 38 commits behind head on main.

Files with missing lines	Patch %	Lines
...ava/org/opensearch/agent/tools/LogPatternTool.java	81.08%	13 Missing and 8 partials ⚠️
...g/opensearch/agent/tools/utils/BrainLogParser.java	92.62%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #474      +/-   ##
============================================
+ Coverage     81.78%   82.11%   +0.32%     
- Complexity      193      333     +140     
============================================
  Files            11       16       +5     
  Lines           961     1571     +610     
  Branches        137      221      +84     
============================================
+ Hits            786     1290     +504     
- Misses          121      194      +73     
- Partials         54       87      +33     

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[Hailong-am]

build failure will handled by #489

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/skills/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/skills/backport-2.x
# Create a new branch
git switch --create backport/backport-474-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 8d988f48cdb2c34d3244bfa3f6669e834d6babc4
# Push it to GitHub
git push --set-upstream origin backport/backport-474-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/skills/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-474-to-2.x.