This method retrieves a list of all active signers with their permissions for a smart wallet.
SignerPermissionsThe method returns a list of SignerPermissions objects, each representing a signer and their permissions.
Each SignerPermissions object contains the following properties:
Signer: The address of the signer.ApprovedTargets: A list of addresses that the signer is approved to interact with.NativeTokenLimitPerTransaction: The maximum amount of native tokens the signer can transfer per transaction.StartTimestamp: The start time for the signer's permissions.EndTimestamp: The end time for the signer's permissions.