REVIEW: [NX-448] Component Storage

https://issues.sonatype.org/browse/NX-448

Goal for this iteration is an interface + initial impl that uses a BlobStore + RecordStore.

NOTE: As per discussion with @mcculls and @mrprescott, the plan is to get this through review in it's current design, then re-work the module later to depend on the upcoming componentservices module (NX-706). Specifically, the RecordType definition for Component will be owned by the TBD module, and this will depend that module to look up Component records when needed.
This is minor, 'cause I don't think Assets can have more than one local Blob, but taken in isolation it looks like this method tries to delete all of the local blobs but then only lets you know if the last deletion was successful.