Feature/33 login in api

[Intrpt]

• [x] Read the idToken from header ("Authorization")
• [x] Validate the idToken and return 401 if it is invalid
  • [x] For Upload a game
  • [x] For Get uploaded games
  • [x] For Get game by id
  • [x] For delete game
• [x] Save the owner when uploading a new game
• [x] Return 403 if the user is not the owner of the game
  • [x] For Get game by id
  • [x] For delete game
• [x] Updated tests
• [x] Removed "FindAll" because it has been replaced by "FindAllByOwner"
• [x] Fixed issue that controller responded but didnt return

! Added "OAUTH_CLIENT" to environment variables (@rieglerthomas )