More api consistency

[hejung]

• asyncmd.utils methods now all require a MDEngine (class) to dispatch to the correct engine submodule

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.06%. Comparing base (233d847) to head (a58a3b1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   79.02%   79.06%   +0.04%     
==========================================
  Files          23       23              
  Lines        2455     2460       +5     
  Branches      316      318       +2     
==========================================
+ Hits         1940     1945       +5     
  Misses        421      421              
  Partials       94       94              

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