Return error for invalid descriptor types

"The library will crash on descriptors without an address form, as it assumes it can always get it but doesn't check it. For instance importing a raw() descriptor would make BDK crash internally. This can be an issue for a server providing an API to register descriptors and monitor them using BDK."

"The descriptor is not checked in Wallet::create_with_params (it only is in load_with_params), allowing to create a Wallet with an incompatible (multipath, hardened steps, ..) descriptor which would break a number of invariants during usage of the Wallet."