Add tests for pyserial compatibility and expand

[puddly]

_wrap_exceptions is now set even when Serial is directly constructed without the from_url helper. I've expanded tests as well and added portstr as a compatibility alias.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.13%. Comparing base (824828e) to head (f4b12d3).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #60      +/-   ##
==========================================
+ Coverage   89.12%   89.13%   +0.01%     
==========================================
  Files          19       19              
  Lines        2879     2882       +3     
==========================================
+ Hits         2566     2569       +3     
  Misses        313      313              

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