OAuth token repository

@mborodenko I think it is safer to try the OAuth token repository on GG-CE server first.

Please apply the changes from genesys-pgr/genesys-server!597 to this project and we can test it properly.

Edited Feb 16, 2021 by Matija Obreza

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information