Search for Site records using a polygon

[dshorthouse]

As a data steward, I wish to search for Site records contained within a hand-drawn polygon.

Acceptance criteria

• User draws a circle, square, or polygon on a map using a web mapping tool
• Alternatively, user pastes GeoJSON or WKT into a textarea box that will be used to query ST_CONTAINS against the geometry field of the Site records
• A list of contained Site records is produced in a table and the columns in the search results include all the attributes, minimally title and description

[dshorthouse]

Some notes to self for the ESRI js SDK that might help devs for this particular web mapping service

Sketching widget (see the source): https://developers.arcgis.com/javascript/latest/sample-code/sketch-geometries/live/
Front-end conversion utilities for ESRI geometry objects to GeoJSON/WKT: https://github.com/terraformer-js/terraformer