Enable navigating across the time component of data layers using the timeline interface

[robyngit]

For data layers that have a time component, enable configuring the time property of that layer so that it can be interacted with using the timeline interface (e.g. indicate which property/attribute indicates time, the time format, etc). What needs to be configured may differ depending on the type of imageryProvider or dataSource that the data layer uses.

[robyngit]

We will need to think more about how we will design the UI for this feature, but here is the first mockup we came up with:

[robyngit]

Stumbled across this Cesium-based map that creates their own timeline interface: https://nasa.github.io/common-mapping-client/branches/master

I particularly like how they have an option to change the time interval between days, months, years, etc.

This comes from nasa/common-mapping-client which appears to be inactive for about a year, but looks to have a similar goal of creating a flexible mapping interface. There could be other design patterns there that are worth checking out.