Generate a STAC catalogue after a series of job is finished

[kvantricht]

Once a OpenEO-GFMAp task is finished, leave the option to create a STAC catalogue listing all the generated products.

By task, I mean once all the related jobs from GFMAP are finished: for example, extraction task is split in many jobs. The end of the task means the end of all the jobs and their related post-processing tasks (Issue #11)

[VincentVerelst]

Currently there is a problem with creating a STAC catalogue, when the batch job results are saved as netCDF. See: Open-EO/openeo-geopyspark-driver#646

[jdries]

This can also be covered by this openEO feature:
Open-EO/openeo-geopyspark-driver#606

[VincentVerelst]

There is currently also a proposal in openeo-processes for a stac_modify process:
https://github.com/Open-EO/openeo-processes/blob/stac-subtype/proposals/stac_modify.json

[VincentVerelst]

Currently, one STAC collection is generated for a series of batch jobs. Next steps:

• Enrich the collection metadata: https://worldcereal.github.io/worldcereal-documentation/design/extractions.html
• Add geometry and bbox to the netCDF item metadata: Item STAC metadata has no geometry or bbox for netCDFs with time series openeo-geopyspark-driver#689

[GriffinBabe]

Merged #52