Check token expirations and use refresh tokens

[YasharF]

If the access token is expired and the app has a valid refresh token, it needs to use the refresh token to obtain a new access token. If both tokens are expired, the app needs to send the user to the oauth provider for new tokens.

[rabahalishah]

@YasharF Hi, Yashar, can you please tell me do we have any refresh token route in the backend right now?

[YasharF]

I have this mostly implemented in dcfad81 ; but need to look into it to make sure it works across the board and if I need to do any refactoring for it.