Disable the wasmtime VM for now

[turbolent]

Description

Put the VM, which uses wasmtime, behind a build flag. Wasmtime does not work on M1 yet

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #991 (61ec74c) into master (eefa27c) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #991      +/-   ##
==========================================
+ Coverage   75.51%   75.55%   +0.03%     
==========================================
  Files         268      267       -1     
  Lines       32910    32852      -58     
==========================================
- Hits        24852    24820      -32     
+ Misses       6921     6905      -16     
+ Partials     1137     1127      -10     

Flag	Coverage Δ
unittests	75.55% <ø> (+0.03%)	⬆️

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