Evaulate Developer Experience With Passkey Shared Singleton Signer

[Nicholas Rodrigues Lordello]

We are a bit indecisive about whether or not we should push for the current implementation with a WebAuthnSignerFactory vs. the previously experimental shared WebAuthnSingletonSigner method that we played around with in the context of 4337.

As such, we want to evaluate which one is nicer from a developer experience perspective.

Expected Outcome

1. Clone the 4337-passkeys example project
2. Replace the launchpad signer with the WebAuthnSingletonSigner implementation
3. if time permits adds the EOA as an additional owner
4. Decide what we want to do.

The main thing we want from this issue is to answer the question:

What do we want to do?

[Nicholas Rodrigues Lordello]

Closed by #404