Add ADR for CO2 stac api entry

[slesaad]

Adds ADR for CO2 dataset for the STAC api

[abarciauskas-bgse]

I think the values which are data the dashboard front end is currently dependent on for rendering tiles should either be omitted for now or part of a custom extension, i.e. https:/NASA-IMPACT/covid-api/blob/adrs/stac-co2/adrs/co2.json#L42-L64 and https:/NASA-IMPACT/covid-api/blob/adrs/stac-co2/adrs/co2.json#L93-L122 should be omitted or use a key indicating a custom extension like "frontend:s3_location"

[anayeaye]

We now have the delta-config to keep in mind as well. It might help if there is metadata that just doesn't fit into any of the predefined attributes in the stac specification.

If I understand correctly, delta config will have more ui-specific metadata about thematic areas and groupings of datasets but it seems like it could also house information like the legend colormap. I'm sure we will need to define at least one custom extension along the way, though, so you may end up needing to mock a custom extension for item properties anyway.

[abarciauskas-bgse]

I think there should be an STAC example both for the collection (co2) and for specific items (s3://covid-eo-data/xco2-base/xco2_16day_base.2022-01-07.tif, not sure if that's a valid date just an example, but items I think should refer to a single tif asset). I think this example might be trying to do both is that right?

[anayeaye]

I second this, I think we need an example of a stac collection document and an item document. I'd be into a working session if we wanted to hash things out over an individual dataset.