fix: find_and_filter for inmemory

[jupyterjazz]

#1640

Hybrid search (find+filter) for InMemoryExactNNIndex was prioritizing low similarities (lower scores) for returned matches. Fixed by adding an option to sort matches in a reverse order based on their scores.

# prepare a query
q_doc = MyDoc(embedding=np.random.rand(128), text='query')

query = (
    db.build_query()
    .find(query=q_doc, search_field='embedding')
    .filter(filter_query={'text': {'$exists': True}})
    .build()
)

results = db.execute_query(query)
# Before: results was sorted from worst to best matches
# Now: It's sorted in the correct order, showing better matches first

[samsja]

this is not the right style for docstring

[jupyterjazz]

I got too used to langchain docstrings lol

[samsja]

Code looks good.

Tho I have to say it is unclear why adding this reverse sorting fix the original problem. Can you add a comment somewhere in the code to explain it ?

FYI: docstring are not in the right format

[github-actions]

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