Add an initial step to GatherMetadataJob to copy all *<core>*.json files to output_dir/original_metadata/uploaded_json

[dbirman]

Is your feature request related to a problem? Please describe.
The original_metadata/ folder currently gets populated by the indexer with the original core metadata files that were uploaded with an asset. This means that partial files like instrument_<modality>.json get thrown away, as well as original <core_file>.json files that get merged.

Describe the solution you'd like
When the GatherMetadataJob starts up any files that match the pattern *<core_file>*.json should be copied to a subfolder output_dir/original_metadata/uploaded_json. This doesn't include files that are grabbed during the gather job or merged.

Describe alternatives you've considered
The files could be thrown away, which is what the current system is setup for.

[dougollerenshaw]

@dbirman is this something that @jtyoung84's team should take on or should it be assigned to you?

[dbirman]

This needs to be coordinated with Jon's team since there's existing code that does this functionality would replace. Ideally we could release the v1 of aind-metadata-mapper first and then put this on a branch to make it easier to test this.