Add endpoint actors for feature flag targeting

Alex Pooleyrequested to merge
ap-endpoint-actor into master

What does this MR do and why?

Add endpoint actors for feature flag targeting. This allows us to directly connect feature flag enablement with code path execution via Kibana.

Introduce Feature::Endpoint actor class to enable targeting feature flags to specific API endpoints, controller actions, or background jobs based on their caller_id from ApplicationContext.

Key features:

  • Feature.endpoint(caller_id) creates endpoint actors
  • Feature.current_endpoint gets endpoint for current request
  • Preserves exact caller_id format from Kibana for easy copy-paste
  • Works with all feature flag operations (enable/disable/opt_out)

Example usage:

  # Copy caller_id directly from Kibana
  Feature.enable(:my_flag, Feature.endpoint('GET /api/v4/projects/:id'))

  # Check if enabled for current request
  Feature.enabled?(:my_flag, Feature.current_endpoint)

  # Opt-out specific endpoint from global rollout
  Feature.enable(:expensive_feature)
  Feature.opt_out(:expensive_feature, Feature.endpoint('GET /api/v4/projects/:id'))

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