catch unhandled OSError when serial port in use

[dudash]

Existing crash:

Traceback (most recent call last):
  File "/opt/homebrew/bin/meshtastic", line 8, in <module>
    sys.exit(main())
  File "/opt/homebrew/lib/python3.9/site-packages/meshtastic/__main__.py", line 1988, in main
    common()
  File "/opt/homebrew/lib/python3.9/site-packages/meshtastic/__main__.py", line 1242, in common
    client = meshtastic.serial_interface.SerialInterface(
  File "/opt/homebrew/lib/python3.9/site-packages/meshtastic/serial_interface.py", line 52, in __init__
    with open(self.devPath, encoding="utf8") as f:
OSError: [Errno 16] Resource busy: '/dev/cu.usbserial-0001'

with updated catch:

OS Error:
  The serial device couldn't be opened, it might be in use by another process.
  Please close any applications or webpages that may be using the device and try again.

Original error: [Errno 16] Resource busy: '/dev/cu.usbserial-0001'

[CLAassistant]

All committers have signed the CLA.

[dudash]

Could even include something like https://github.com/Textualize/rich to pretty up CLI output with color. But figured that'd be a better as a larger feature request PR.

[ianmcorvidae]

We're using print_color in some places, but could probably expand that and if rich provides something more beneficial that might be okay to switch to. The colorization stuff is currently behind the cli extras as well, so it won't need to be installed on more limited machines/within more limited packaging ecosystems.

[ianmcorvidae]

This looks good to me! Thanks for the PR.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.26%. Comparing base (fc3b81d) to head (e2fe359).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
meshtastic/__main__.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #734      +/-   ##
==========================================
- Coverage   60.35%   60.26%   -0.10%     
==========================================
  Files          24       24              
  Lines        3970     3976       +6     
==========================================
  Hits         2396     2396              
- Misses       1574     1580       +6     

Flag	Coverage Δ
unittests	60.26% <0.00%> (-0.10%)	⬇️

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