Respect CMake args, enable forcing toolchains on/off

[timkpaine]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.19048% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.32%. Comparing base (1f498bf) to head (b7bc651).
⚠️ Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
hatch_cpp/toolchains/cmake.py	66.66%	3 Missing ⚠️
hatch_cpp/config.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   83.23%   87.32%   +4.08%     
==========================================
  Files          13       14       +1     
  Lines         841     1065     +224     
==========================================
+ Hits          700      930     +230     
+ Misses        141      135       -6     

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