dev(hansbug): add is_free_port and get_free_port

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e9e7a04) 99.90% compared to head (00f4b52) 99.90%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #90 +/- ## ======================================= Coverage 99.90% 99.90% ======================================= Files 106 107 +1 Lines 3180 3207 +27 ======================================= + Hits 3177 3204 +27 Misses 3 3 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `99.90% <100.00%> (+<0.01%)` | :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=Hankson+Bradley#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/HansBug/hbutils/pull/90?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hankson+Bradley) | Coverage Δ | | |---|---|---| | [hbutils/system/network/\_\_init\_\_.py](https://codecov.io/gh/HansBug/hbutils/pull/90?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hankson+Bradley#diff-aGJ1dGlscy9zeXN0ZW0vbmV0d29yay9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | | | [hbutils/system/network/port.py](https://codecov.io/gh/HansBug/hbutils/pull/90?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hankson+Bradley#diff-aGJ1dGlscy9zeXN0ZW0vbmV0d29yay9wb3J0LnB5) | `100.00% <100.00%> (ø)` | | 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=Hankson+Bradley). 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=Hankson+Bradley)

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