Feature gate test framework

[Leo-Besancon]

• document all added functions
• try in sandbox /simulation/labnet
  • if part of node-launch, checked using the resync_check flag
• unit tests on the added/changed features
  • make tests compile
  • make tests pass
• add logs allowing easy debugging in case the changes caused problems
• if the API has changed, update the API specification

The goal of this PR is to avoid building massa_models with test-exports feature when building massa's workspace.

[bilboquet]

looks good to me

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9a34d7a) 71.78% compared to head (dc00150) 71.78%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4642   +/-   ##
=======================================
  Coverage   71.78%   71.78%           
=======================================
  Files         291      291           
  Lines       51642    51642           
=======================================
  Hits        37069    37069           
  Misses      14573    14573           

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[Leo-Besancon]

@bilboquet @AurelienFT I updated the CI to use rust-script instead of cargo-script that seems unmaintained and caused the unit_tests check to hang.