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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