INSUFFICIENT_RESOURCES for accounts with a lot of tokens

[rkalis]

E.g. https://revoke.cash/address/0xeF41421593f0211154665670Ffb925c63243c3C6?chainId=56

We'll probably need to do some rate limiting on getting token data and the like.

[rkalis]

For now we've fixed this issue by limiting concurrent ky requests to 500. It is technically still possible that RPC requests will cause insufficient resources errors, but this is only really possible on chains that don't support multicall3. Perhaps the best option here is to make sure that the remaining few chains get a multicall3 deployment.