Use the ui/safe data URL filter for the values used in \data TeX macros

[dpvc]

This PR causes the \data macro in TeX to use the ui/safe data filter when the safe extension is loaded. This prevents the \data macro from entering data attributes that could be harmful within frameworks that use data attributes for code control.

It also removes a reference that looks up a data-MJX attribute that is never actually set anywhere in the code.

In addition, it cleans up the mechanism used to set the MathML attribute and class filters by adding a service method to the MathML and MathMLCompile objects to set those values rather that casting the jax to any and setting them by hand.

Finally, it corrects an incorrect type that appears in the jsDoc for one of the safe methods.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.12%. Comparing base (106e5ac) to head (ec04842).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1561   +/-   ##
========================================
  Coverage    87.12%   87.12%           
========================================
  Files          392      392           
  Lines        89098    89102    +4     
  Branches      5046     5048    +2     
========================================
+ Hits         77628    77632    +4     
  Misses       11450    11450           
  Partials        20       20           

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