Refactor Grok validate pattern to iterative approach

[sandeshkr419]

Description

Unchecked recursive call in https://github.com/opensearch-project/OpenSearch/blob/main/libs/grok/src/main/java/org/opensearch/grok/Grok.java#L183 is expensive and indeterministic.

1. Changing the approach to iterative to prevent stack overflow.
2. Adding a limit on max depth size for a pattern resolution to prevent OOM.

Related Issues

Check List

• [x] Functionality includes testing.
• [x] API changes companion pull request created, if applicable.
• [x] Public documentation issue/PR created, if applicable.

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