Select a range of time periods

## Describe the solution you'd like

The API allows queries of time periods "greater or equal to" and "less than or equal to". We should add functionality to eesyapi to allow it to take advantage of these.

I'm thinking this should encapsulate 3 options:
- tp_min <= tp <= tp_max
- tp >= tp_min
- tp <= tp_max

Feel like it's simplest to just use >= / <= functionality and not complicate things with adding in < and > as well, but could be wrong.

# Linked items

Note to make a vignette on selecting time periods in #46