Added ability to specify a prefix to use on the vue side, e.g. state_

[astrofrog]

This will be useful for spacetelescope/jdaviz#4112

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.69%. Comparing base (688987c) to head (b22c1e5).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
+ Coverage   97.64%   97.69%   +0.04%     
==========================================
  Files          28       28              
  Lines        3999     4070      +71     
==========================================
+ Hits         3905     3976      +71     
  Misses         94       94              

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