oai: express current CS API in OpenAPI 3 spec
oai: express current CS API in OpenAPI 3 spec

The control service API is expressed as OpenAPI 3 specification.

GitOrigin-RevId: befec63608a6fd8955a1f2a595bf0e4af30d05e6

Oncilla/scion,netsec-ethz/scion,netsec-ethz/scion,netsec-ethz/scion,Oncilla/scion,Oncilla/scion,netsec-ethz/scion,Oncilla/scion