Invoice resource in admin API

[dmitry-sinina]

resource should allow fetch invoice with all attributes + origination prefixes, origination networks, termination prefixes, termination networks data + odf and pdf files

[hcaldicott]

To provide some context on how this will be used, this API endpoint will be utilised to build an integration with Hostbill, using some of the features available here: https://blog.hostbillapp.com/2020/09/04/new-feature-diy-metered-billing/ (and also in the Hostbill SDK).

I would like to be able to run an API call, as an admin, to Yeti-Switch containing the customer's account ID and a date range. This api call should return a summary of destination networks/prefixes, call counts, durations and amounts, just like the tables displayed in the invoice otherwise would, e.g.:

Each prefix/network would ideally be it's own JSON object/collection containing the relevant fields within - call count, duration, amount, etc.