Returns an object containing various wallet state info.
curl --user myuser --data-binary '{"jsonrpc":"1.0","id":"1","method":"getwalletinfo","params":[]}' -H 'content-type:text/plain;' http://127.0.0.1:8332/{
"walletname": "default",
"walletversion": 169900,
"format": "sqlite",
"balance": 1.23456789,
"unconfirmed_balance": 0.00000000,
"immature_balance": 0.00000000,
"txcount": 42,
"keypoolsize": 1000,
"paytxfee": 0.00000000,
"private_keys_enabled": true,
"descriptors": true
}