force dynamic enum generation for emmet-core

[tsmathis]

adding the explicit call to importlib forces the full module import, and triggers the corresponding exception to autogenerate the enums.

the static import statement can cause importlib's bootstrapping to fail in environments that only partially initialize the module at startup

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.28%. Comparing base (1d490e0) to head (157bfd0).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1097       +/-   ##
===========================================
+ Coverage   72.66%   90.28%   +17.61%     
===========================================
  Files          77      147       +70     
  Lines        5015    14157     +9142     
===========================================
+ Hits         3644    12781     +9137     
- Misses       1371     1376        +5     

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