adapter: Change JSON and XML parser interface to add objects directly into a given AbstractObjectStore

This allows to use a CouchDBObjectStore or other database-backed ObjectStores without collecting the objects in memory first.

The parser functions should return a set of Identifiers of the parsed objects instead.

See aas.adapter.aasx.AASXReader.read_into() LINK, which already has a similar interface.

Progress:

• JSON Deserialization
• XML Deserialization