Oauth Account System

[stadust]

This is a continuation of #135, but I messed up pushing to @peonii's branch, and now cannot update that PR anymore :skull:

License Acceptance

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[stadust]

Only difference to #135 so far is that I squashed everything, and resolved some left over merge markers

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 21.18644% with 279 lines in your changes missing coverage. Please review.

Project coverage is 27.21%. Comparing base (53ce7e8) to head (e3a689e). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pointercrate-user-api/src/pages.rs	2.32%	84 Missing :warning:
pointercrate-user/src/auth/oauth2/get.rs	0.00%	51 Missing :warning:
pointercrate-user/src/auth/oauth2/post.rs	0.00%	41 Missing :warning:
pointercrate-user/src/auth/oauth2/mod.rs	0.00%	23 Missing :warning:
pointercrate-user-pages/src/login.rs	0.00%	17 Missing :warning:
pointercrate-user/src/auth/oauth2/patch.rs	0.00%	15 Missing :warning:
pointercrate-user/src/auth/mod.rs	78.46%	14 Missing :warning:
pointercrate-user/src/config.rs	45.00%	11 Missing :warning:
pointercrate-user-pages/src/account/profile.rs	0.00%	10 Missing :warning:
pointercrate-user/src/auth/get.rs	52.38%	10 Missing :warning:
... and 2 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #182 +/- ## ========================================== - Coverage 28.00% 27.21% -0.80% ========================================== Files 116 121 +5 Lines 8231 8507 +276 ========================================== + Hits 2305 2315 +10 - Misses 5926 6192 +266 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.