Add traffic management module to the python libraries

[h3lix1]

Adding traffic_management to be part of the configuration options when using --set and --get.

This relates to meshtastic/protobufs#849 and can't be pushed until the protobufs are complete.

Placing this in draft for now.

[ianmcorvidae]

This all seems reasonable to me; assuming the protobuf and firmware changes also get merged, would you mind pinging me to get back to this whenever it's ready to go out of draft? I'm m_ia_n on discord, which is more likely to catch my attention these days.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.79%. Comparing base (cdf893e) to head (8f6b79e).

Files with missing lines	Patch %	Lines
meshtastic/mesh_interface.py	0.00%	2 Missing ⚠️
meshtastic/node.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #890      +/-   ##
==========================================
- Coverage   59.82%   59.79%   -0.04%     
==========================================
  Files          24       24              
  Lines        4329     4333       +4     
==========================================
+ Hits         2590     2591       +1     
- Misses       1739     1742       +3     

Flag	Coverage Δ
unittests	59.79% <25.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.