feat: Split pubkeys from tokens according to #39

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.29630% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.89%. Comparing base (183689c) to head (d04d593).

Files	Patch %	Lines
gmt-api/src/services/auth_service/structs.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #44 +/- ## ========================================== + Coverage 77.79% 77.89% +0.09% ========================================== Files 35 35 Lines 1657 1669 +12 ========================================== + Hits 1289 1300 +11 - Misses 368 369 +1 ```

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