Create a new chat session from the parameter appId
The resourceSlug is a URL parameter of the teamId associated with the user.
JSON body containing appId of the app to use for this session.
Mongodb Object id, unique identifier, length of 24 characters fitting the following regex; [a-f0-9]{24}
Successful operation, redirect to '/{resourceSlug}/session/{sessionId}'. Redirect field contains path to the newly created session to initialise app.
Server response after successsfully adding a new object