Add id property getter to qdrant retriever

[stellasia]

Description

Adds support for Qdrant payloads where the neo4j ID field is nested, for instance:

{
    'some_stuff': 'xxxxxxxxx',
    'metadata': {
        'uid': 'myUID',  # <- the ID we want to retrieve
    }
}

With this PR, users will be able to do this with:

    def my_id_getter(point: ScoredPoint) -> Any:
        if point.payload is None:
            raise Exception("Payload is None")
        return point.payload["metadata"]["uid"]

    retriever = QdrantNeo4jRetriever(
        driver=driver,
        client=client,
        collection_name="myColl",
        id_property_neo4j="uid",
        id_property_getter=my_id_getter,
    )

Type of Change

• New feature
• Bug fix
• Breaking change
• Documentation update
• Project configuration change

Complexity

Note

Please provide an estimated complexity of this PR of either Low, Medium or High

Complexity:

How Has This Been Tested?

• Unit tests
• E2E tests
• Manual tests

Checklist

The following requirements should have been met (depending on the changes in the branch):

• Documentation has been updated
• Unit tests have been updated
• E2E tests have been updated
• Examples have been updated
• New files have copyright header
• CLA (https://neo4j.com/developer/cla/) has been signed
• CHANGELOG.md updated if appropriate

[serengil]

this appends list instead of tuple into the variable result_tuples. do you mean something like:

result_tuples.append((self.get_match_id_from_point(point), point.score))

[stellasia]

Good point, updated in 468802b

[serengil]

LGTM