Implement "indirect reverse" fields, those which pass via an EmbeddedMetadata #82
Description
#81 implemented #72 for the direct case, where two KG objects are linked.
However, reverse links that pass via EmbeddedMetadata instances are not yet supported.
For example: SoftwareVersion has a field copyright, which contains
embedded metadata of type Copyright (which does not have its own ID).
Copyright has a field holders which links to Person, among others.
At present, it is not possible to access the SoftwareVersion from a Person
by way of a reverse field, since the link is not direct. (You can still make a forward query, though).