Import Private Key into Glueby::Wallet

[rantan]

Regarding Active Record Wallet, we can't get UTXO set when we just import private key. We need to rescan the chain with the new private key.

[azuchi]

Since the wallet feature of Core cannot be used, following methods can be considered.

• Scan using scantxout RPC. In this case, it will take some time for the scan to complete.
• Query the Index Server for UTXO. In this case, Index Server is required.