add client-version to transformation submission

[MattShirley]

Add client-version variable every transformation submission.

For issue: ssl-hep/ServiceX#832

Backend work: ssl-hep/ServiceX#1412

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.39%. Comparing base (8ba7498) to head (1d72e1a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #736   +/-   ##
=======================================
  Coverage   98.38%   98.39%           
=======================================
  Files          31       31           
  Lines        2234     2237    +3     
=======================================
+ Hits         2198     2201    +3     
  Misses         36       36           

Flag	Coverage Δ
unittests	98.39% <100.00%> (+<0.01%)	⬆️

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