preprocessor - cache file tokenization for common includes

[BrettMayson]

ACE current master goes 30s to 18s user on my machine

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.4%. Comparing base (6a310d0) to head (48eb609).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
libs/preprocessor/src/parse/mod.rs	91.6%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
libs/preprocessor/src/parse/mod.rs	94.4% <91.6%> (-0.3%)	⬇️