Introduces optional authentication for Neo4j and Memgraph adapter handling.
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**DCO Affirmation**
I affirm that all code in every commit of this pull request conforms to
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Co-authored-by: codegen-sh[bot] <131295404+codegen-sh[bot]@users.noreply.github.com>
Co-authored-by: openhands <openhands@all-hands.dev>
Co-authored-by: hajdul88 <52442977+hajdul88@users.noreply.github.com>
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