feat: add authorizedSigners to operators

[merklefruit]

Closes #40

Important

WIP

Summary of the changes:

Added new logic to add a set of authorized signers per operator.
This solves the problem of operators having to use their operator private key to run their bolt-sidecar: after this upgrade, operators will be able to specify additional EOAs that can make commitments on their behalf.

This will require an upgrade of all our contracts. Here's how the new flow will look like:

1. registerOperator(rpcEndpoint, extraData, authorizedSigners): A set of authorized signers can be specified at registration time, along with the operator RPC and extradata.
2. operators can always update the set of authorized signers in the following ways:
   a. addOperatorAuthorizedSigner(address signer) allows an operator to add a signer to the authorized set
   b. pauseOperatorAuthorizedSigner(address signer) allows an operator to pause a signer. it will still be considered active until the end of the current epoch, and from the next epoch onward it will be considered paused or inactive
   c. unpauseOperatorAuthorizedSigner(address signer) self-explanatory, but will consider the signer active again after the end of the current epoch
   d. removeOperatorAuthorizedSigner(address signer) self-explanatory, but will remove the signer from the set if they are currently paused

[merklefruit]

📚 $\text{Stack Overview}$

Pulls submitted in this stack:

• feat: add authorizedSigners to operators #41 👈
• feat: add contract bindings #38
• main

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