auditStorage to support a remote logging collector

It is clear on the documentation that the Audit Device type `file` is not rotated so i suggest :

1- Adding audit file rotation feature or if it is available then can we document how to ?
2- Allow sending the audit logs to any other log collector like `Datadog` or any other by exporting the audit logs as STDOUT

Start by reviewing the vault-helm chart's auditStorage configuration and the documentation referenced in the issue. Clarify whether the intended outcome is audit-file rotation, documentation of existing rotation, or exporting audit logs to stdout for a remote collector; done should be defined for one selected scope.

Written by the indexing model from the issue text.