Add unified filter to marqo

[sky-2002]

Description: This PR intends to add a unified filtering interface to neum ai, which can be mapped to filters of respective sinks. To test this, I have made changes to MarqoSink and tested them. Addresses this issue.
Approach: To start with, I have assumed that the user provides the filter as a string like "field1 <= value1, field2 != value2" which is then mapped to a class called FilterCondition. This is subject to change as per discussions and review.

Example usage:

from SinkConnectors.MarqoSink import MarqoSink

ms = MarqoSink(url="http://0.0.0.0:8882", index_name="neum_index", api_key=None)
ms.store(vectors_to_store=neum_vecs)

# Both produce same result
# ms.search(vector=[1.0, 0.4], number_of_results=3, filter={"position": "x-axis", "power":4})
ms.search(vector=[1.0, 0.4], number_of_results=3, filter="position = x-axis, power=4")

Note: Benefit of this unified filter over dictionary is that we can now add range based queries.

[sky-2002]

Hi @ddematheu , I have made some changes as per discussion here, looking for review.

[ddematheu]

Looks good, will implement changes back into other sinks.