Move snake_to_pascal back to root util

[GDYendell]

This is useful outside of EPICS contexts

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.38%. Comparing base (56dccba) to head (49e4183).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #277      +/-   ##
==========================================
+ Coverage   90.37%   90.38%   +0.01%     
==========================================
  Files          68       68              
  Lines        2368     2371       +3     
==========================================
+ Hits         2140     2143       +3     
  Misses        228      228              

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