Add route for public access without credentials

[codecov[bot]]

Codecov Report

Base: 37.92% // Head: 37.55% // Decreases project coverage by -0.36% :warning:

Coverage data is based on head (e4459c6) compared to base (5e38d17). Patch coverage: 23.07% of modified lines in pull request are covered.

:exclamation: Current head e4459c6 differs from pull request most recent head fe613b3. Consider uploading reports for the commit fe613b3 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #52 +/- ## =========================================== - Coverage 37.92% 37.55% -0.37% =========================================== Files 12 12 Lines 683 695 +12 =========================================== + Hits 259 261 +2 - Misses 424 434 +10 ``` | Flag | Coverage Δ | | |---|---|---| | pytest | `37.55% <23.07%> (-0.37%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/PnX-SI/UsersHub-authentification-module/pull/52?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI) | Coverage Δ | | |---|---|---| | [src/pypnusershub/routes\_register.py](https://codecov.io/gh/PnX-SI/UsersHub-authentification-module/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI#diff-c3JjL3B5cG51c2Vyc2h1Yi9yb3V0ZXNfcmVnaXN0ZXIucHk=) | `0.00% <ø> (ø)` | | | [src/pypnusershub/routes.py](https://codecov.io/gh/PnX-SI/UsersHub-authentification-module/pull/52/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI#diff-c3JjL3B5cG51c2Vyc2h1Yi9yb3V0ZXMucHk=) | `22.81% <23.07%> (-0.54%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI)

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