Create a service to build npm metadata cache record

🌱 Context

With an introduction of a new model Packages::Npm::MetadataCache and a new service Packages::Npm::GenerateMetadataService, now it's time to connect them.

⚒ Proposal

Create Packages::Npm::MetadataCacheService that will manage Packages::Npm::MetadataCache records: create a new or update existing one with a metadata generated by Packages::Npm::GenerateMetadataService.

Additionally mount an uploader in Packages::Npm::MetadataCache to store metadata in the object storage.