Move metadata.nd.json logic to aind-data-schema

[mekhlakapoor]

Is your feature request related to a problem? Please describe. There is currently duplicated logic in aind-data-asset-indexer and aind-metadata-mapper to create the metadata.nd.json.

Describe the solution you'd like Move that code to the data-schema

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.