Verified Proxy: Pre-fetch state using eth_createAccessList and add caching to EVM calls

[bhartnett]

This is an example of how we can add caching to improve the performance of the RPC endpoints which use the EVM in the verified proxy.

I've also implemented an optimization where we call the downstream eth_createAccessList RPC endpoint to pre-fetch the expected account and storage keys and then fetch all the state using eth_getProof (slots for each account are batched together), and then the state is put in the caches before executing the EVM call.

In my testing the pre-fetching provides a reasonable speed up but the verified eth_call is still slower then the unverified eth_call due to the additional network calls required which is to be expected.

Adding support for connecting to the downstream RPC provider via WebSockets would likely improve performance further.

[bhartnett]

@chirag-parmar Here is some example code which we could merge into your draft PR if you like. This is what I was recently suggesting we do to improve the eth_call performance.

[chirag-parmar]

@bhartnett thank you for the work. But merging into this draft branch is probably not useful, no? I'll ping you when I create a PR for evm in verified proxy?

[bhartnett]

@bhartnett thank you for the work. But merging into this draft branch is probably not useful, no? I'll ping you when I create a PR for evm in verified proxy?

Up to you if you merge it or not. I suggested that because I though that branch was where you were staging all your verified proxy changes but if keeping it separate works then fair enough.