plain JSON support for proofs flag in reshare + resign

[jordanssv]

Description

Reshare and resign should support feeding json proofs directly on cli

Motivation

The path option is appropriate for users building a reshare/resign command for themselves. However, it is not a good solution for users coming from the web app. Web app users will upload their proofs.json in the UI, select new operators (in the case of reshare), sign the message, and expect a reshare/resign docker command that will be built using these inputs.

Requirements

• Add a new proofs flag for plain JSON support
• Ensure the flag works with bulk operation