✨ lock refactor

[juftin]

This PR is a small refactor on the PipCompileLock class to have a single attribute, environment (PipCompileEnvironment), instead of many attributes. This gives the class full access to the parent PipCompileEnvironment class it's injected into.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4badcf9) 95.56% compared to head (99e798f) 95.53%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
hatch_pip_compile/lock.py	94.11%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   95.56%   95.53%   -0.04%     
==========================================
  Files          16       16              
  Lines         857      851       -6     
  Branches      139      139              
==========================================
- Hits          819      813       -6     
  Misses         24       24              
  Partials       14       14              

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