Honor log_request_body setiing in compliance audit log

[cwperks]

Description

This PR ensures that the value of log_request_body is honored for the compliance logging. When using the compliance config, this PR will ensure that the document's source is audit logged in the audit_request_body when a document is first created, but otherwise it will not. When write_log_diffs is enabled, you can trace the full history of changes to documents on the tracked indices by looking for all events on the target index.

By default, the security index gets events audit logged so Compliant logging is a good feature to use to trace changes to the security configuration.

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

Enhancement

Issues Resolved

opensearch-project#4534

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

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