Add support for Pixi environments

[renan-r-santos]

Fixes #20

[codecov]

Codecov Report

Attention: Patch coverage is 69.19431% with 65 lines in your changes missing coverage. Please review.

Project coverage is 69.19%. Comparing base (15e1334) to head (4044018).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pixi_kernel/provisioner.py	64.81%	15 Missing and 4 partials ⚠️
pixi_kernel/handlers.py	44.82%	16 Missing ⚠️
pixi_kernel/env.py	36.84%	12 Missing ⚠️
pixi_kernel/fallback.py	0.00%	10 Missing ⚠️
pixi_kernel/__init__.py	66.66%	4 Missing ⚠️
pixi_kernel/__main__.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main      #42       +/-   ##
============================================
- Coverage   100.00%   69.19%   -30.81%     
============================================
  Files            4       10        +6     
  Lines          102      211      +109     
  Branches        13       22        +9     
============================================
+ Hits           102      146       +44     
- Misses           0       61       +61     
- Partials         0        4        +4     

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