Reuse ModuleResolutionCache when updating Program

[ajafff]

Similar to microsoft/TypeScript#31100

In order to correctly implement CompilerHost.resolveModuleNames (and resolveTypeReferenceDirectives) we need to create a new instance of ProjectHost for each Program (or at least ProjectHost needs to know the CompilerOptions of the currently created/updated Program).
The cache needs to be reset if the CompilerOptions change (or for the next Program).

The linter cache #370 might benefit from this change as it needs to resolve everything as well.