message: feat(sdk-coin-sol): make walletpassphrase optional
  Ticket:
diff: @@ -114,7 +114,7 @@ interface RecoveryOptions {
  backupKey?: string; // Box B
  bitgoKey: string; // Box C - this is bitgo's xpub and will be used to derive their root address
  recoveryDestination: string; // base58 address
  - walletPassphrase: string;
  + walletPassphrase?: string;
  durableNoncePK?: string;
  durableNonceSK?: string;
  }
  