feat: update networks config

[kyscott18]

Similar to https://wagmi.sh/core/getting-started#create-config

import { createConfig } from "ponder";
import { mainnet, optimism } from "viem/chains";

export default createConfig({
  chains: [mainnet, optimism],
  rpcUrls: {
    [mainnet.id]: string | string[],
    [optimism.id]: string | string[],
  }, 
  // ... more config
});

Related

#1291 #1290

[kyscott18]

In order to support the EIP 1193 transport api, we could change the type to string | string[] | Transport

[kyscott18]

Also need to support the remaining chain specific config: maxRequestsPerSecond, disableCache, and pollingInterval.