Example time-based quantities and times
This is just the beginning of this PR, exploring examples for the scheduling milestone. Focusing on getting the quantity and time properties defined for different use cases, irrespective of transfers or composition.
Started with work, as possibly the simplest, want to make usage be as similar as possible.
Things to note:
- calendar property
- observedQuantity name change
- all the time properties can be = or > than the quantity properties (the quantity properties are what is counted, the time properties are what relates to scheduling)