Add --enter-dfu for entering DFU mode on NRF52 devices via admin message

[ianmcorvidae]

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[codecov]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 61.94%. Comparing base (158cac6) to head (6812f50).

Files	Patch %	Lines
meshtastic/node.py	12.50%	7 Missing ⚠️
meshtastic/__main__.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #556      +/-   ##
==========================================
- Coverage   62.12%   61.94%   -0.18%     
==========================================
  Files          14       14              
  Lines        2904     2917      +13     
==========================================
+ Hits         1804     1807       +3     
- Misses       1100     1110      +10     

Flag	Coverage Δ
unittests	61.94% <23.07%> (-0.18%)	⬇️

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