ERC-4337: milestone planning

[JeneaVranceanu]

What context is your feature request related to?

ERC-4337

This issue is focused on preparing a milestone, a clear vision and a path for implementing the ERC-4337 support.

What solution would you like?

Most parts of ERC-4337 are not related to web3swift in terms that web3swift does not provide node software. The plan and the complete backlog of tasks to be completed to mark ERC-4337 as supported shouldn't be large.

Image borrowed from medium post.

Out of these 4 stages shown in the image we only touch on the first: Users and Applications.
At least that's my understanding at the moment. We will see what else we need as we go.

Any additional context?

No response

[JeneaVranceanu]

Ah, okay, I see more intersections with the library.

I'll quickly draft an incomplete list of things we need:

• new model UserOperation;
• API to send UserOperation to mempool. I expect a way similar to eth_sendTransaction/eth_sendRawTransaction but now for UserOperation;
• default implementation of EntryContract with the ability to call it directly. In case user wants to a bundle of 1 or more UserOperation objects;
• Bundler implementation - a way to bundle operations locally (do we need it/can we implement it? Not sure about the "For each aggregator, run the aggregator-specific code to create aggregated signature, and update the UserOps" in the Bundler's algorithm).

The more I read the standard the more tasks I see.
I'll have to devote a healthy chunk of time to make something useful that we can eventually call a plan.

All thoughts are welcome.