Retrieves a list of external signers configured with the -signer option.

How is this used?

You're the manager of a security team responsible for safeguarding a valuable artifact. Each team member has a special key required to access the artifact. Similarly, in the Bitcoin world, external signers (like hardware wallets or special security devices) act as these team members, each holding a key (signing capability) to authorize transactions. The 'enumeratesigners' command is like taking roll call to see which security team members (external signers) are present and ready to protect your Bitcoin. It lists all the external devices or services you've set up to work with your Bitcoin wallet, providing details like their unique identifiers and names. This helps in managing and verifying the devices that can authorize transactions, ensuring your Bitcoin's security.