fix map type validation issue in processors

[zane-neo]

Description

When user uses map type configuration in processors, the validation will validate all other fields instead of only the configured fields, sometimes if other fields has unsupported types, user will get exception which is not expected.

Multiple processors uses similar validation logic but code are duplicated, in this PR a new Util is been added to extract the duplicated code to a common place and reused by different processors.

Issues Resolved

https://github.com/opensearch-project/ml-commons/issues/2309

Check List

• [ ] New functionality includes testing.
  • [ ] All tests pass
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
• [ ] Commits are signed as per the DCO using --signoff

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