Support termius groups expansion from config file

[lejmr]

This patch is allowing to define a group to each host section using comment line # termius:group XXX in .ssh/config file.

[codecov-io]

Codecov Report

Merging #125 into master will decrease coverage by 0.25%.
The diff coverage is 31.57%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   63.29%   63.03%   -0.26%     
==========================================
  Files          68       68              
  Lines        2591     2608      +17     
  Branches      246      251       +5     
==========================================
+ Hits         1640     1644       +4     
- Misses        916      927      +11     
- Partials       35       37       +2

Impacted Files	Coverage Δ
termius/porting/providers/ssh/provider.py	61.11% <27.27%> (-9.35%)	⬇️
termius/porting/providers/ssh/adapter.py	69.04% <33.33%> (-3.46%)	⬇️
termius/porting/providers/ssh/parser.py	62.5% <40%> (-3.22%)	⬇️

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