remove/update cli command batch-send-payments

[deepthiskumar]

With #4553, the internal flow of local transactions changed causing batch-send-payments to send keypair over rpc. We either change it such that it uses graphql or delete if no longer in use. Once this is done, we can remove the serialized versions in user_command_input.ml

[aneesharaines]

Can we just remove this for now?

[aneesharaines]

Create a separate ticket for the follwup work to reenable properly