Function registerLedgerWallet

Registers a policy based on a provided descriptor.

This function will:

1. Store the policy in ledgerState inside the ledgerManager.
2. Avoid re-registering if the policy was previously registered.
3. Skip registration if the policy is considered "standard".

It's important to understand the nature of the Ledger Policy being registered:

• While a descriptor might point to a specific output index of a particular change address, the corresponding Ledger Policy abstracts this and represents potential outputs for all addresses (both external and internal).
• This means that the registered Ledger Policy is a generalized version of the descriptor, not assuming specific values for the keyPath.