**Related issue:** Resolves#42883
Added a new premium GET /api/_version_/fleet/rest_api endpoint that
returns the contents of the embedded `api_endpoints.yml` artifact.
**Related issue:** Resolves#42881
- Added user_api_endpoints table to track per user API endpoint
permissions.
- Added service/api_endpoints, used to handle service/api_endpoints.yml
artifact.
- Added check on server start that makes sure that
service/apin_endpoints.yml is a subset of router routes.
Juan Fernandez