Add a specialized module cloner that allows ignoring a set of members

[lsrcz]

This pull request adds a specialized module cloner that allows ignoring a set of members. In the C API, we use this to transform a type checked module into another one with some functions stripped.

[proppy]

In the C API, we use this to transform a type checked module into another one with some functions stripped.

Can you give a concrete example?

[lsrcz]

Can you give a concrete example?

Basically all my recent PRs are mostly built towards a DSLX file specializer. We monomorphize all the parametric functions, replace their call sites, and then strip the original parametric versions.

The C API currently uses the type checked module as the root for managing all the AST node lifetimes, and a module is always tied to a typed checked module. This is the reason why we need to transform a type checked module into another one.