[Stats Page] - Add Ability to Graph Time Series Data

[Peyton-McKee]

Description

Currently the create graph endpoint only supports creating graphs that are numerical values grouped by some category. We need the ability to display changes of data over time, like number of workpackages made over a period of time.

Acceptance Criteria

Able to graph values over time.

Proposed Solution

See how the group by selection was made. I assume well need to limit this functionality to the COUNT measure for now, then query all the items that are searched for in the graphGen element, then filter them by the start and end date, and create a map for each day or time period and see when the date created values are made to group them into those days.

Mocks

epic #2219