Add new view bill service

https://eaflood.atlassian.net/browse/WATER-4155

We are building our first proper page which will replace the bill summary page the [water-abstraction-ui](https://github.com/DEFRA/water-abstraction-ui) currently provides. Rather than try to show all licences _and_ all their transactions for a bill on one page we'll instead list the licences. Users can then see the transaction details by selecting a licence.

We've already made several other changes to support this. This change adds a new service that orchestrates fetching the information needed (see [Add new fetch billing account service](#493) and [Add new fetch bill service](#495)), passing it through to a presenter ([Add new Multi-licence bill presenter](#496)) and returning the result.