Integrate a MEV-protected RPC on the Bundler

[TheDivic]

What?

Integrate a MEV-protected RPC for Ethereum only using the research gathered by @TakGN in this ticket:
https://github.com/bcnmy/engineering-private/issues/94

Why?

We are experiencing frontrunning on some networks like Ethereum and Polygon which causes us to lose profits and our clients to have a bad user experience when their tx gets frontran.

How?

We need to check if we can split the RPC calls into two categories and route the requests to appropriate providers:

• Simple read calls should use a normal provider
• Contract calls & sending transactions should use a MEV-protected RPC endpoint.