Print a summary adding all the totals from different accounts

It would be nice if the users could see and aggregate value of all the totals in different accounts grouped by token denom. This way a user with multiple `cosmos` accounts for example could see how many `ATOMS` he has across many accounts

Start by locating the Go code that reads account totals and handles token denoms. Implement an aggregate view grouped by denom across multiple accounts, then verify that a user can see the combined total for each denom.

Written by the indexing model from the issue text.