add package tests to CI pipeline
Added a couple of tests to the Raster2STAC package (currently at 52% coverage). This ensures consistent behaviour of the package in producing valid stac JSONs.
Current issues:
- Kerchunk loading dependencies on openeo_pg_parser_networkx runs into errors with pydanticv2,
- Read Multi-band COGs as NetCDF or directly read Multi-band CoGs
- Write specific tests for Create Collection, Create Items, et al.