fix(release): Fix fat CLI compilation

[Natoandro]

• Fix fat CLI compilation

• Bump to 0.4.2

• Bump wasmtime to 21

• Bump rust to 1.78.0

• The change comes with new or modified tests

• Hard-to-understand functions have explanatory comments

• End-user documentation is updated to reflect the change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.52%. Comparing base (bbdfd35) to head (e157f1f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #730      +/-   ##
==========================================
- Coverage   74.05%   73.52%   -0.53%     
==========================================
  Files         120      120              
  Lines       13777    14142     +365     
  Branches     1407     1416       +9     
==========================================
+ Hits        10202    10398     +196     
- Misses       3549     3717     +168     
- Partials       26       27       +1     

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[Yohe-Am]

So the tests took 30 minutes with each file taking an avg of 30 seconds. Not entirely sure why python_test is taking that long.

[michael-0acf4]

lgtm