Improve zntrack.meta.Environement

[PythonFZ]

The env.yaml has been extended:

global:  # support for global envs on all stages
  ZNTRACK_EXAMPLE: '1'
stages:
  EnvAsDict:
    SPECIAL_ENV: '25'
    env:  # you can group envs now
      OMP_NUM_THREADS: '1'

• support for groups zntrack.meta.Environement: dict
• support for global project.run(environment: dict = ...)

[codecov]

Codecov Report

Merging #575 (ee08357) into main (417e256) will decrease coverage by 0.20%.
The diff coverage is 79.31%.

@@            Coverage Diff             @@
##             main     #575      +/-   ##
==========================================
- Coverage   87.87%   87.67%   -0.20%     
==========================================
  Files          20       20              
  Lines        1311     1331      +20     
  Branches      480      490      +10     
==========================================
+ Hits         1152     1167      +15     
- Misses        159      164       +5     

Flag	Coverage Δ
fulltest	87.67% <79.31%> (-0.20%)	⬇️

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Impacted Files	Coverage Δ
zntrack/cli/__init__.py	83.60% <37.50%> (-7.31%)	⬇️
zntrack/fields/meta/__init__.py	88.88% <90.90%> (+0.75%)	⬆️
zntrack/project/zntrack_project.py	81.67% <100.00%> (+1.51%)	⬆️

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