Added a property is_public for User model

[codecov[bot]]

Codecov Report

Base: 37.55% // Head: 37.67% // Increases project coverage by +0.12% :tada:

Coverage data is based on head (e0c6928) compared to base (9979a9d). Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #54 +/- ## =========================================== + Coverage 37.55% 37.67% +0.12% =========================================== Files 12 12 Lines 695 698 +3 =========================================== + Hits 261 263 +2 - Misses 434 435 +1 ``` | Flag | Coverage Δ | | |---|---|---| | pytest | `37.67% <66.66%> (+0.12%)` | :arrow_up: | 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/54?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/db/models.py](https://codecov.io/gh/PnX-SI/UsersHub-authentification-module/pull/54/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI#diff-c3JjL3B5cG51c2Vyc2h1Yi9kYi9tb2RlbHMucHk=) | `74.16% <66.66%> (-0.11%)` | :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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