Implement Multi-Account Multicall for Token Balances

[darkwing]

Presently we use a single multicall per account, which can be non-performant for users with many accounts in their wallet.

We should create a spike around this multicall which allows sending multiple addresses:

https://github.com/EthereumClassicDAO/multicall3

Successful implementation should save a drastic number of RPC calls for our users.