Introduce ModuleAvailableCache

[awaelchli]

🚀 Feature

Motivation

RequirementCache exists, but it is very general. It works for both modules as well as packages. It has a very strict check for requirements of a package. This check can fail even if the package is actually importable successfully, see example: Lightning-AI/pytorch-lightning#16464

In these cases, the module_available check is better suited for what we want to check. But it can only be called as a function, not as a cache like the RequirementCache.

Pitch

Add ModuleAvailableCache, with a cache implementation like RequirementCache, but we will use the module_available function as as the check function.

Alternatives

User has to resolve any package conflicts in their environment, even if they are harmless.

Additional context

See Lightning-AI/pytorch-lightning#16464

[awaelchli]

cc @carmocca @Borda

[carmocca]

Sounds good to me