feat: filetest execution refactor

[thehowl]

Creating this for CI, in the meantime. This is the good news:

todo:

• re-integrate stdlib tests properly

https://gno.howl.moe/faster-tests/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.80%. Comparing base (6c5329d) to head (f6aaa29).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #3119    +/-   ##
========================================
  Coverage   63.80%   63.80%            
========================================
  Files         549      549            
  Lines       78819    78479   -340     
========================================
- Hits        50288    50073   -215     
+ Misses      25142    25021   -121     
+ Partials     3389     3385     -4     

Flag	Coverage Δ
contribs/gnodev	61.16% <ø> (ø)
contribs/gnofaucet	14.82% <ø> (ø)
gno.land	73.67% <ø> (-0.03%)	⬇️
misc/genstd	79.72% <ø> (ø)
tm2	62.42% <ø> (-0.03%)	⬇️

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