CSMA-CA Fixes part 2

[SamClercky]

• Better error handling
• Fix of a bug in filtering packets
• Allow the user to chose a channel
• Fix congestion issue

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 73.82%. Comparing base (8c9bf10) to head (43a557f).

Files	Patch %	Lines
dot15d4/src/csma/mod.rs	76.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   73.78%   73.82%   +0.04%     
==========================================
  Files          36       36              
  Lines        5538     5562      +24     
==========================================
+ Hits         4086     4106      +20     
- Misses       1452     1456       +4     

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