Implement filter-based deletion for CassandraVectorStore to support more
flexible document removal based on metadata filters.
Key changes:
- Add doDelete(Filter.Expression) implementation
- Implement workaround for Cassandra's limitations in direct filtered deletion
- Fetch matching documents first, then delete by IDs
- Add integration tests for various filter deletion scenarios
- Support simple and complex filter expressions
- Includes tests for:
* Deleting by simple equality filter
* Deleting by string-based filter expression
* Deleting by complex AND filter expression
Provides consistent deletion capabilities across vector store implementations
while addressing Cassandra-specific constraints.
Signed-off-by: Soby Chacko <soby.chacko@broadcom.com>
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