Support Google login in ERP5
This merge request contains the feature to login in ERP5 with Google Account.
Also, this branch is based on the work done in !185 (merged)
We have a lot of discussion about this changes in !179 (closed), but with a lot of merge conflicts, a new MR is better to review.
This branch will wake up the discuss of "Moving API Keys from preference to a better place", I can work on it but I am not sure if we have a good design yet.
Any comment is welcome