Manager API: Added CAS provider API (includes openapi spec & tests)
This PR contains new API methods to provision CAS applications in LLNG configuration the same way one's can already provision OIDC and SAML providers using the existing API (crud operations and pattern search).
I've introduced a findByServiceUrl for CAS applications which mirror findByEntityId (saml) and findByClientId (oidc). ServiceURL do not have a unique constraint in configuration, which is the reason why findByServiceUrl returns a list of CAS application and not a single result like findByEntityId and findByClientId.
Note: My editor has removed extra spaces in openapi specifications, which make the diff longer.