[FEATURE] Orders: Query param for aggregating paginated orders (`?limit=all`) (RLJS-136)

This is a first pass at aggregating the responses from ripple. It includes a default pagination limit (currently set to 10)
Could we get rid of `maybeGetAggregateOrders` and instead put an if statement at the beginning of this `getAggregateOrders` function that says

```
if (!isAggregate) {
  return Promise.resolve(prevResult);
}
```

and update the promise calling chain above?