Support pagination for transaction aggregate

[faustbrian]

The transaction aggregate is responsible for gathering the transactions of all wallets that belong to a profile. The difficulty with streamlining this process is that we need the cursor from each coin to paginate the results but this cursor differs per coin and can be a string or number.

What needs to be figured out is how we keep track of the cursors inside of the aggregate to not leak the pagination logic out of the aggregate.