Add new format rule for wrapping case bodies

[kimdv]

Hi!

In out codebase we have a rule stating that all case bodies need to be on a newline.
So my toughts was to add this SwiftFormat to enforce this rule, so other could benefit from this too.

Looking forward to the feedback :D

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.30%. Comparing base (afd7c1f) to head (55c125e).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2476      +/-   ##
===========================================
+ Coverage    95.28%   95.30%   +0.02%     
===========================================
  Files          166      167       +1     
  Lines        25304    25330      +26     
===========================================
+ Hits         24112    24142      +30     
+ Misses        1192     1188       -4     

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[calda]

Thanks!