Make module IDs numbers instead of strings (#69431)
Makes compressed (hashed) module IDs of type `ModuleId::Number` instead
of `ModuleId::String`, which makes builds smaller by removing the need
to add `"` before and after each ID.
To fully use Javascript's `Number` capabilities, `ModuleId::Number` is
changed from `u32` to `u64`, and `module_id_to_lit` ensures that numbers
bigger than Javascript's `MAX_SAFE_INTEGER` are stringified in
Javascript. We could also represent them es `BigInt`.
