Support for hardware flow control config

[Adminiuga]

Support for hardware flow control

[codecov-io]

Codecov Report

Merging #403 (b8e1f4f) into dev (94e2d0a) will decrease coverage by 0.02%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##              dev     #403      +/-   ##
==========================================
- Coverage   99.97%   99.94%   -0.03%     
==========================================
  Files          44       44              
  Lines        3354     3359       +5     
==========================================
+ Hits         3353     3357       +4     
- Misses          1        2       +1     

Impacted Files	Coverage Δ
bellows/uart.py	99.58% <75.00%> (-0.42%)	⬇️
bellows/config/__init__.py	100.00% <100.00%> (ø)

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