Added authentication behavior

[EtienneDx]

Changes:

• Authentication endpoints

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 70.70707% with 58 lines in your changes are missing coverage. Please review.

Project coverage is 86.24%. Comparing base (2bc3fbc) to head (c880f02).

Files	Patch %	Lines
gmt-api/src/services/mod.rs	0.00%	16 Missing :warning:
gmt-api/src/services/structs.rs	16.66%	15 Missing :warning:
gmt-api/src/main.rs	0.00%	11 Missing :warning:
gmt-api/src/services/auth_service/structs.rs	40.00%	9 Missing :warning:
gmt-api/src/error.rs	0.00%	3 Missing :warning:
database/src/db_handle/assignment.rs	50.00%	1 Missing :warning:
database/src/db_handle/comment.rs	50.00%	1 Missing :warning:
gmt-api/src/services/auth_service/mod.rs	98.38%	1 Missing :warning:
gmt-api/src/services/auth_service/user_token.rs	96.77%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #32 +/- ## ========================================== - Coverage 87.61% 86.24% -1.37% ========================================== Files 27 33 +6 Lines 2155 2341 +186 ========================================== + Hits 1888 2019 +131 - Misses 267 322 +55 ```

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[EtienneDx]

Coverage is low due to test modules being untested (No point testing mock structs and impl).

Front-end is untested. Might be required to add proper testing at some point, not urgent right now.