Replace keycloak config with ouath2

[ds-psosnowski]

Description

Changed

• Update IRS API Swagger documentation to match AAS 3.0.0
• Changed name of spring's OAuth2 client registration from 'keycloak' to 'common' like below:

  spring:
    security:
      oauth2:
        client:
          registration:
            keycloak:
              authorization-grant-type: client_credentials
              client-id: 
              client-secret: 
          provider:
            keycloak:
              token-uri:
  

  to:

  spring:
    security:
      oauth2:
        client:
          registration:
            common:
              authorization-grant-type: client_credentials
              client-id: 
              client-secret: 
          provider:
            common:
              token-uri:
  

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files

[ds-jhartmann]

LGTM