fix(notify): bring back support for raw shoutrrr in config

[JosephKav]

Allow

notify:
  shoutrrr_notifier:
    type: shoutrrr
    url_fields:
      raw: generic://web.example.com:443/path/to/webhook

fixes #703

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.83%. Comparing base (7b7aaf6) to head (1024cf3).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #719      +/-   ##
==========================================
+ Coverage   98.83%   98.83%   +0.01%     
==========================================
  Files         132      132              
  Lines        8904     8906       +2     
==========================================
+ Hits         8799     8801       +2     
  Misses         80       80              
  Partials       25       25              

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