Add option to export meter data in GeoJSON

[nllong]

Any background context you want to provide?

Exporting Meter data isn't readily available. One can export from the "meters" tables within a single property.

What's this PR do?

Since meters and meter readings are relational, adding this export functionality to a flat CSV file doesn't make sense. We could eventually add to XLSX (similar to ESPM). This PR adds the data to a geojson record.

• Adds meters and meter readings to the property obj in geojson
• Adds option to exclude the export in the modal (the default is to exclude)

How should this be manually tested?

• go to an org with properties that have meters
• select a few properties
• check the "export meter readings" and then "export geojson"
• verify that the exported geojson file has the meter data.

What are the relevant tickets?

further address #2946

Screenshots (if appropriate)