This little command-line tool extract the name and encrypted XPrv of
known wallets and spits them back in a user-friendly format on stdout.

$ export-wallets --mainnet --wallet-db-path state-wallet-mainnet/wallet-db --keyfile state-wallet-mainnet/secret.key
[
    {
        "encrypted_root_private_key": "5da58210e3f6e2b1e24659158554f91bb5970202ba0e0cd2d32767ce3c2893c29515a5469493f6133857c0dc86f127aa70e46d047424e07f7221715357bfb35052aed22cefd53ea7d75b5804add54e653c21e03ffd7c01cb8f6c033f7d383cc127046148d89a1828b76bdb46b56f6fec06d31b5b412dc68ab4b5ffa2418e7e8d",
        "name": "My Wallet",
        "passphrase_hash": "31347c387c317c57434478796c7064635a736853367a6d3150766d54456a34667038795a34623145557868627765347a36596645413d3d7c48544739445a456d4f2b79535a6a705a76553145614d795a437170732b43347330704738414562745638773d"
    }
]

The format matches exactly the JSON format expected by the
cardano-wallet for restoring legacy wallet from xprv.

$ export-wallets --mainnet --wallet-db-path state-wallet-mainnet/wallet-db --keyfile state-wallet-mainnet/secret.key
[
    {
        "encrypted_root_private_key": "b824f5268bdf05d783b0c594936e51c65d6d155021ddcbdb3370bb7a51caba4bedece046fc9d12143ce900d8238e444904e08a85af80299b012e7f12030a2ab6d3d1cf6fc565476c17326baebddcf31c5e3409ba697b9bf04ac588cb59868c22d043e0237a3ba2eb167d1504dd93f788fc4a72503a261cf338ad7e4cf8837aff",
        "name": "My Wallet",
        "passphrase_hash": null
    },
    {
        "encrypted_root_private_key": "5da58210e3f6e2b1e24659158554f91bb5970202ba0e0cd2d32767ce3c2893c29515a5469493f6133857c0dc86f127aa70e46d047424e07f7221715357bfb35052aed22cefd53ea7d75b5804add54e653c21e03ffd7c01cb8f6c033f7d383cc127046148d89a1828b76bdb46b56f6fec06d31b5b412dc68ab4b5ffa2418e7e8d",
        "name": "My Wallet",
        "passphrase_hash": "31347c387c317c57434478796c7064635a736853367a6d3150766d54456a34667038795a34623145557868627765347a36596645413d3d7c48544739445a456d4f2b79535a6a705a76553145614d795a437170732b43347330704738414562745638773d"
    }
]

Before that, the script would simply create a new empty database and pretty much
fail to export every wallet in the keystore

Name is therefore set to null.

  ```json
  $ export-wallets --mainnet --keyfile state-wallet-mainnet/secret.key
  [
      {
          "encrypted_root_private_key": "18b952a968ccbac047f9c227dd05fced84ba85a1f83daf54f0a3c0de3e5664502678b1ba34a0b44ce22a2b54f39830570bdfeeed0a2f8586aa988fa5399987252b81f30b3c1e4c39e1edb16a4c7975eea106fc5d12d3b4fa516b9332f777defba949a42ef709a2d2f5c64057e99987c545b6e014f8cd9502bd5b800ddc6e10b7",
          "is_passphrase_empty": true,
          "name": null,
          "id": "f1aaaf1e1e6db1255ec2d59d50c5db892ff20330",
          "passphrase_hash": "31347c387c317c5743424875746242496c6a66734d764934314a30727a79663076657375724954796376766a793150554e377452673d3d7c54753434596d6e547957546c5759674a3164494f7974474a7842632b432f7862507657382b5135356a38303d"
      },
      {
          "encrypted_root_private_key": "6d9e6a5135d373fb62eadaf02bc8f5ecf35148806721c704c6dbfcf818ff958f1fc4a933542c423f5b8621cfe6404c4b208f2c96f6246082dffbc9fb1029a79ed33651377731e0e59e0233425a55257782c5adaa768da0567f43c1c6c0c18766ed0a547bb34eb472c120b170a8640279832ddf18002887f03c15dea59705422d",
          "is_passphrase_empty": false,
          "name": null,
          "id": "05377e480bd68a2da04f00c39ce5886e4746ed1f",
          "passphrase_hash": "31347c387c317c574342652b796362417576356c2b4258676a344a314c6343675375414c2f5653393661364e576a2b7550766655513d3d7c2f376738486c59723174734e394f6e4e753253302b6a65515a6b5437316b45414941366a515867386539493d"
      }
  ]
  ```