Add filter_enabled flag to RBAC filter

*Title*: Add filter_enabled flag to RBAC filter

*Description*:
Currently, [Envoy's RBAC filter](https://github.com/envoyproxy/envoy/blob/0bf518c005dc2372e40ee79e9f22fefb07abe29a/api/envoy/extensions/filters/http/local_ratelimit/v3/local_rate_limit.proto#L61) does not have a `filter_enabled` field that other http filters have (e.g. [localRateLimit](https://github.com/envoyproxy/envoy/blob/0bf518c005dc2372e40ee79e9f22fefb07abe29a/api/envoy/extensions/filters/http/local_ratelimit/v3/local_rate_limit.proto#L61) and [extAuth](https://github.com/envoyproxy/envoy/blob/0bf518c005dc2372e40ee79e9f22fefb07abe29a/api/envoy/extensions/filters/http/ext_authz/v3/ext_authz.proto#L158)). Adding this flag to the RBAC filter would provide flexibility in enabling or disabling the filter at runtime based on runtime settings allowing for dynamic management of filter behavior without requiring a full configuration deployment.

I can prepare a patch for this if it sounds reasonable.