Add GraphKBConnection.version

[mathieulemieux]

Make it easier for internal and third party apps to get the version of all GraphKB components.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.48%. Comparing base (8777c66) to head (6ab42bc).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #112      +/-   ##
===========================================
+ Coverage    83.46%   83.48%   +0.01%     
===========================================
  Files           18       18              
  Lines         2546     2549       +3     
===========================================
+ Hits          2125     2128       +3     
  Misses         421      421              

Flag	Coverage Δ
unittests	83.48% <100.00%> (+0.01%)	⬆️

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