Added support for parsing full-curation files-list metadata.json's

...s/pexable/ingest_envoy/ingest_envoy/ingestion_manifest.py

...xecutables/pexable/ingest_envoy/ingest_envoy/launchers.py

...xecutables/pexable/ingest_envoy/ingest_envoy/solicitor.py

...xable/ingest_envoy/ingest_envoy/std_img_manifest_utils.py

...xable/ingest_envoy/ingest_envoy/std_obs_manifest_utils.py

...voy/test/examples/full_curation_evla_image_manifest2.json

...t/input_files/test-full-curation-image-evla-metadata.json

...tables/pexable/ingest_envoy/test/test_curator_manifest.py

...i/executables/pexable/ingest_envoy/test/test_solicitor.py