codegen: Recursive derives for types

[lexnv]

Extend the derive_for_type to recursively add the derives on all inner fields.

For example, to derive Clone on MultiLocation one would need to do the following:

derive_for_type(path = "xcm::v2::multilocation::MultiLocation", derive = "Clone"),
derive_for_type(path = "xcm::v2::multilocation::Junctions", derive = "Clone"),
derive_for_type(path = "xcm::v2::junction::Junction", derive = "Clone"),
derive_for_type(path = "xcm::v2::NetworkId", derive = "Clone"),
derive_for_type(path = "xcm::v2::BodyId", derive = "Clone"),
derive_for_type(path = "xcm::v2::BodyPart", derive = "Clone"),
derive_for_type(
    path = "bounded_collections::weak_bounded_vec::WeakBoundedVec",
    derive = "Clone"
)

Ideally, developers could type just:
derive_for_type(path = "xcm::v2::multilocation::MultiLocation", derive = "Clone", recursive),