Copy layer level metadata into solution item

[MikeMillerGIS]

Currently, if the service has metadata, this gets added to the solution item, but if a layer in a service has metadata, this is not persisted. The summary and description information is stored in metadata(description is also stored in the properties.json/defintion).

Example call to layer level metadata
https://services2.arcgis.com/PWJUSsdoJDp7SgLj/ArcGIS/rest/services/VaccineProviders_public_a68e5c65bb5b4aaeb9ad4f01fca55627/FeatureServer/0/metadata