Add support for multiple return values in `get_type_for_variants`

[JulianGCalderon]

When returning an enum, we use get_type_for_variants to build the return type. This function doesn't support when one of the variants have more than one value.

src/types/enum.rs#L763:

// TODO: Change this function to accept a slice of slices (for variants). Not all uses have a slice
//   with one `ConcreteTypeId` per variant (deploy_syscalls has two types for the Ok() variant).

Once this has been implemented, we could update the deploy syscalls` to use this function, rather than doing it manually.

[BiliqisO]

Hi, can I get assigned this issue?