Add Neuter command for wallet

[b00f]

Describe the problem you'd like to solve

Currently, there is no way to neuter a wallet.
A neutered wallet is a wallet that does not store private keys or seeds. It is a read-only wallet and can only be used to retrieve balances or stakes.
For BLS keys, it can also create new addresses without needing the private key.

While the vault object supports neutered wallets, we currently lack a command to convert a full wallet into a neutered wallet.

Describe the ideal solution

We need to add a new command to the wallet application to neuter a wallet.
The command should check if the wallet is full or already neutered. If it is a full wallet, it should create a neutered copy and save it to the specified path.