Fix support for EOF creation tx in evmc run

[pdobacz]

This PR will be accompanied by a PR in evmone, fixing the handling of top level creation msgs when validation EOF.

Here, we only replicate the behavior of creation txs for EOF - if the code begins with EOF magic it will be interpreted as an EOF creation transaction and the msg kind will be set appropriately, in order to be consumed by the vm.execute

[pdobacz]

I needed to do two tweaks to the CI for this to work:

• bump build-macos - not sure what I'm doing here, just best-guess, deprecation announcement here
• downgrade VS 2022 on appveyor - MSVC 1940 (17.40.x) is failing for a reason beyond my comprehension, using "Previous..." image as I got a hint from some old post puts it back at 17.39.x which worked. I can put in an issue to un-downgrade it lest we forget to

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.41%. Comparing base (0a642bc) to head (874f134).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #713      +/-   ##
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- Coverage   93.46%   93.41%   -0.05%     
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  Files          26       26              
  Lines        3884     3887       +3     
  Branches      402      404       +2     
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+ Hits         3630     3631       +1     
  Misses        140      140              
- Partials      114      116       +2