Description

This PR modifying co-signing steps according to the recent changes (Slack thread).

The updated flow:

Get the userOperation hash by calling getUserOpHash(userOps) on the v07 entrypoint.
Sign the resulting hash value with the PCI private key.
ABI-encode two signatures (co-signer and userOperation signature) into one.
Set the above-encoded signature to the updated userOperation and call getSignature method on the userOpBuilder contract.
Set the returned signature from userOpBuilder call to userOperation.
Send the resulting userOperation to the bundler.

How Has This Been Tested?

Tested manually step by step. Contracts call unit tests that can be run manually at the moment.