API support for Time based Reporting Metrics

Has been discussed and mocked, etc.. but creating a ticket to track the progress.

i.e.

Last 24HR, Last Week, Last Month, Year-to-Date, etc..

for

Total Sales
Tips
Net Sales
Average Sale
Refunds

No files, tests, or entry points are named. Start by reviewing the existing reporting API and the prior mockups or discussion, then define the supported time ranges and metrics before implementation. Done means the API contract and behavior for the requested reporting periods are specified and tested.

Written by the indexing model from the issue text.