Better support --ch-index for other commands (traceroute, telemetry, position)

[ianmcorvidae]

I think this also means things that send packets generally now always support --ch-index which seems correct, heh.

[codecov]

Codecov Report

Attention: Patch coverage is 23.68421% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 62.12%. Comparing base (bb6e3b7) to head (4d10b6e).

Files	Patch %	Lines
meshtastic/mesh_interface.py	10.52%	17 Missing ⚠️
meshtastic/__main__.py	36.84%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #555      +/-   ##
==========================================
- Coverage   62.25%   62.12%   -0.14%     
==========================================
  Files          14       14              
  Lines        2896     2904       +8     
==========================================
+ Hits         1803     1804       +1     
- Misses       1093     1100       +7     

Flag	Coverage Δ
unittests	62.12% <23.68%> (-0.14%)	⬇️

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