Add API for external GPUCompiler uses to opt-out of disk cache

[vchuravy]

Doing it on the compiler params seems a bit odd, but for Enzyme the target is variable and
the params is special.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 36.66%. Comparing base (4178477) to head (e110b67).

Files	Patch %	Lines
src/execution.jl	0.00%	2 Missing ⚠️
src/interface.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #592       +/-   ##
===========================================
- Coverage   75.12%   36.66%   -38.47%     
===========================================
  Files          24       24               
  Lines        3482     3434       -48     
===========================================
- Hits         2616     1259     -1357     
- Misses        866     2175     +1309     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[maleadt]

The whole idea of the params is that they are opaque and not used in GPUCompiler itself. I don't think we should change that. Why can't this be a part of the CompilerConfig?