Support new implementation of stac fields querystring parameter

[EmileSonneveld]

On stac.openeo.vito.be, adding '&fields=+properties.proj:epsg' in the query string makes sure this field is included in the results (by default it is hidden)
But when doing the same on stac-openeo-dev.vgt.vito.be, it removes all fields and only shows the one specified. Once this logic is promoted to prod, our stac catalogs will give errors. Best it to specify a list of all properties we need to have no issues in the transition period

Url that shows the issue: https://stac-openeo-dev.vgt.vito.be/search?limit=20&bbox=8.058428808185612%2C40.66%2C8.999%2C41.291280668691115&datetime=2017-12-22T00%3A00%3A00Z%2F2017-12-24T23%3A59%3A58.999000Z&collections=copernicus_r_utm-wgs84_10_m_hrvpp-vi_p_2017-now_v01&fields=+id

Where the code needs to be updated:

openeo-geopyspark-driver/openeogeotrellis/load_stac.py

Line 240 in dd4b2d9

for property_name in {"proj:epsg", "proj:bbox", "proj:shape"}.union(all_properties.keys())

(cc @bossie )

[EmileSonneveld]

I understood that stac.openeo.vito.be waits for this ticket to be implemented to update their server.

[JeroenVerstraelen]

I checked with Stijn Caerts and he responded with the following

Hey Jeroen, on our side, there is no deadline to complete this issue. The Terrascope and openEO STAC API versions are decoupled, so we have already done the release within Terrascope. The one for openEO can happen when you are ready.

So we can delay this issue until the next sprint.