sccache now tracks compiler hits/misses on a per language basis.

[robertmaynard]

Previously sccache was actually tracking hits and misses on a compiler id basis, and guessing on the language.

This is an issue for compilers like clang which support C, C++, and CUDA. In that case we want to clearly state what language we are getting hit or misses on to help user diagnose issues.

[robertmaynard]

To properly do this I hoisted the Language type out of c.rs and made it understand Rust. I am open to other suggestions on how we can track languages across c.rs and rust.rs if others don't like this approach.

[codecov-commenter]

Codecov Report

Attention: 72 lines in your changes are missing coverage. Please review.

Comparison is base (eb292cd) 29.83% compared to head (043d866) 29.74%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1895      +/-   ##
==========================================
- Coverage   29.83%   29.74%   -0.09%     
==========================================
  Files          50       50              
  Lines       17898    17967      +69     
  Branches     8624     8669      +45     
==========================================
+ Hits         5339     5344       +5     
- Misses       7407     7467      +60     
- Partials     5152     5156       +4     

Files	Coverage Δ
src/compiler/c.rs	35.71% <100.00%> (-2.45%)	⬇️
src/compiler/clang.rs	53.95% <ø> (ø)
src/compiler/diab.rs	50.00% <ø> (ø)
src/compiler/msvc.rs	46.78% <ø> (-0.10%)	⬇️
src/compiler/nvcc.rs	41.17% <ø> (ø)
src/compiler/nvhpc.rs	34.09% <ø> (ø)
src/compiler/rust.rs	31.88% <100.00%> (+0.06%)	⬆️
src/compiler/tasking_vx.rs	43.63% <ø> (ø)
src/compiler/gcc.rs	57.11% <0.00%> (-0.12%)	⬇️
src/server.rs	32.00% <30.00%> (-0.13%)	⬇️
... and 2 more

... and 5 files with indirect coverage changes

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