[1] Copy backend from iar/backend repo

Code mostly unchanged from iar/backend repo except for refreshing test code. Split in to iar_project, iar (models) and api applications.

apitokens app added for oauth2 to access/refresh token support.

API moved under /api endpoint and basic /api/profiles/user added which also returns user's groups and insts.

Frontend still to be done but API can be tested via by http://localhost:8000/api/ui or http://localhost:7000/ swagger UI. Use the /api/tokens/exchange/google-oauth2/ endpoint to get access token to authenticate to API using "Bearer " authentication header.

Closes: #2 (closed)