Add changes for user_id and user_type

[Himan10]

1. Adding user_type in the accounts.user model.
2. Adding user_id in the JWT token, so when the access token will go with the request, we can fetch the user_id from the token.
3. Changes in the jobs model as well.

NOTE: I am working on this

[Himan10]

Changes for this issue have been merged by yogesh.