Migrate raven to sentry

[lodewiges]

Apparently Raven is replaced by Sentry, so this PR migrates that.
Followed: https://docs.sentry.io/platforms/ruby/migration/ & csvalpha/sofia#821
Fixes #450

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.92%. Comparing base (7d785cc) to head (3bed348).
Report is 1 commits behind head on staging.

Additional details and impacted files

@@             Coverage Diff             @@
##           staging     #503      +/-   ##
===========================================
- Coverage    99.92%   99.92%   -0.01%     
===========================================
  Files          203      202       -1     
  Lines         2772     2768       -4     
===========================================
- Hits          2770     2766       -4     
  Misses           2        2              

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