dev(hansbug): add is_free_port and get_free_port

[HansBug]

No description provided.

[codecov]

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

@@           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%)	⬆️

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Impacted Files	Coverage Δ
hbutils/system/network/__init__.py	100.00% <100.00%> (ø)
hbutils/system/network/port.py	100.00% <100.00%> (ø)

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