* Refactor codebase so that doc_type metadata is used instead of namespaces for making distinction between documents without embeddings, documents with embeddings and labels
* Fix parameter name in integration test
* Remove code under comment in add_type_metadata_filter method
* Fix mypy and pylint checks
* Add release note
* Apply minimal changes: rename method, update method docs and remove redundant method
* Mypy fixes
* Fix docstrings
* Revert helper methods for fetching documents when the number of documents exceeds Pinecone limit
* Remove unnecessary attributes in PineconeDocumentStore
* Fix unit test
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Co-authored-by: Ivana Zeljkovic <ivana.zeljkovic@smartcat.io>
Co-authored-by: DosticJelena <jelena.dostic@smartcat.io>