Add support of GroK command including default patterns

[YANG-DB]

Description

Add PPL grok command described here
Map grok to the next spark sql regexp_extract command

Related campaign :
#408

Issues Resolved

#451

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[LantaoJin]

How do this file resources use in PR? I cannot find any test which leverage the files in folder resource/patterns

[YANG-DB]

GrokExpression statically loads the default patterns in the patterns folder

    public static class GrokExpression extends ParseExpression {
        private static final GrokCompiler grokCompiler = GrokCompiler.newInstance();

        static {
            grokCompiler.registerDefaultPatterns();
        }

afterwards any such string '.+@%{HOSTNAME:host}' is matched and replaced with the default patterns that are stated in that folder
The FlintSparkPPLGrokITSuite uses these patterns for the tests

[LantaoJin]

L324 need to remove.
BTW, can we add a line to explain current limitation of Grok? such as

Limitation: Overriding existing field is unsupported:
source=accounts | grok address '%{NUMBER} %{GREEDYDATA:address}' | fields address

[LantaoJin]

LGTM for the rest

[LantaoJin]

LGTM for the rest

[opensearch-trigger-bot]

The backport to 0.5-nexus 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/opensearch-spark/backport-0.5-nexus 0.5-nexus
# Navigate to the new working tree
pushd ../.worktrees/opensearch-spark/backport-0.5-nexus
# Create a new branch
git switch --create backport/backport-598-to-0.5-nexus
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 176e150e0e7b5e94872d2f4ca8b3c2388f7a40f9
# Push it to GitHub
git push --set-upstream origin backport/backport-598-to-0.5-nexus
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/opensearch-spark/backport-0.5-nexus

Then, create a pull request where the base branch is 0.5-nexus and the compare/head branch is backport/backport-598-to-0.5-nexus.