RANGER-5595: Audit grant and revoke role operations

[arnabnandy7]

What changes were proposed in this pull request?

This pull request fixes RANGER-5595 by generating audit results for role grant and revoke operations when a non-null RangerAccessResultProcessor is provided.

The changes:

• Add audit processing to RangerBasePlugin#grantRole() and RangerBasePlugin#revokeRole().
• Generate audit results for both successful and failed operations.
• Preserve the existing role audit semantics and request metadata.
• Remove the Hive authorizer’s manual role audit generation to prevent duplicate audit events.
• Add focused unit tests covering successful role grants and failed role revocations.

How was this patch tested?

The focused unit tests for role grant and revoke auditing were run with:

mvn -pl agents-common -DskipTests=false -Dtest=TestRangerBasePluginRoleAudit test

Results:

Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
BUILD SUCCESS

The tests verify:

• Audit result generation for a successful role grant.
• Denied audit result generation for a failed role revocation.
• Audit action, access type, global resource, and failure policy ID values.