Refactor `env.h` free functions to static `Project` class

[codecov[bot]]

Codecov Report

Merging #201 (109794c) into main (a3d2c7f) will decrease coverage by 0.10%. The diff coverage is 94.87%.

@@            Coverage Diff             @@
##             main     #201      +/-   ##
==========================================
- Coverage   99.06%   98.95%   -0.10%     
==========================================
  Files          62       62              
  Lines        1807     1818      +11     
  Branches      494      501       +7     
==========================================
+ Hits         1790     1799       +9     
  Misses          1        1              
- Partials       16       18       +2     

Impacted Files	Coverage Δ
...cc/lib/target/src/target/friend/compile_object.cpp	100.00% <ø> (ø)
...toolchain/include/toolchain/api/toolchain_verify.h	100.00% <ø> (ø)
buildcc/lib/env/src/env.cpp	92.31% <92.31%> (-7.69%)	:arrow_down:
buildcc/lib/args/src/register.cpp	99.08% <100.00%> (ø)
...ldcc/lib/target/include/target/common/target_env.h	100.00% <100.00%> (ø)
buildcc/lib/target/src/generator/generator.cpp	98.11% <100.00%> (ø)
buildcc/lib/target/src/generator/task.cpp	100.00% <100.00%> (ø)
buildcc/lib/target/src/target/target.cpp	100.00% <100.00%> (ø)
buildcc/lib/target/src/target/tasks.cpp	100.00% <100.00%> (ø)

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