Atomically set ERC-1967 and enforce implementation invariants

[amiecorso]

A simpler approach to the EIP7702Proxy. Protects vulnerable implementations by enforcing that setting an implementation on the proxy can also be validated to have achieved a desired initialization state or any other specific invariant important to that account, reverting if validation conditions aren't met. This allows us to enforce that a vulnerable implementation is never pointed to in a vulnerable state.

Other benefits:

• allows us to remove the GUARDED_INITIALIZER
• allows us to remove the explicit initialize function and streamline with setImplementation
• allows us to stop overriding the fallback function on the parent Proxy
• simplifies pre-initialization receive behavior

We have 100% test coverage 🎉

[ilikesymmetry]

Need to let this sit a bit, but this kind of mechanism feels helpful. Main downside I see is just proliferating the number of deployed contracts for this system although their implementations and connections are super simple

[amiecorso]

will replace these later when development stops