Add angle offset

[mdoucet]

There's an angle offset available in the data reduction backend. This PR exposes it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.45%. Comparing base (5cced0e) to head (9c01bc3).
Report is 29 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #136      +/-   ##
==========================================
- Coverage   60.52%   60.45%   -0.07%     
==========================================
  Files         121      121              
  Lines       10129    10139      +10     
==========================================
- Hits         6131     6130       -1     
- Misses       3998     4009      +11     

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[jmborr]

looks 👌