Resolution refactor

[nerfZael]

The goal of this PR is to bring the Rust Client resolution structure closer to its JS counterpart.

This includes:

• Renaming the core resolvers module into resolution and moving the resolvers to the resolvers crate
• Removing UriResolverLike (which doesn't work in Rust since it requires the enum to "know" about the different resolvers) and replacing it with type casting which is more Rust idiomatic
• Implementing a resolver_vec macro to simplify building nested resolvers (it autocasts arrays of resolvers to the base UriResolver type)
• Removal of UriResolverWithHistory base trait and impl since it doesn't really work if used with types outside of the core crate (due to Rust limitations), and while it does slightly simplify tracking resolution history for the user, it also masks that process and makes it more confusing