feat: add async support for Chroma

[Ryzhtus]

Related Issues

• fixes add run_async to chroma retrievers #1389

Proposed Changes:

added async version of the following ChromaDocumentStore methods:

• _ensure_initialized_async
• count_documents_async
• filter_documents_async
• write_documents_async
• delete_documents_async
• search_async
• search_embeddings_async

added run_async methods for ChromaQueryTextRetriever and ChromaEmbeddingRetriever

How did you test it?

• added test_document_store_async.py that tests methods above

Notes for the reviewer

I still need to check a couple of tests in test_document_store_async.py and write tests for retrievers, will be done with next commits

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.