Migrate away from web3.js

Web3.js is just really really bad. Probably once we have #278 and #287 the next step is just to migrate the remaining web3 stuff to Viem. It will give us better type safety, better support for more platforms (web3 contains some nodejs specific things) and remove a lot of the stupidly tricky code like web3.js's terrible batching system combined with its garbage error handling