Add string-based filter deletion alongside the Filter.Expression-based deletion
for Redis vector store, providing consistent deletion capabilities with
other vector store implementations.
Key changes:
- Add delete(Filter.Expression) implementation using Redis FT.SEARCH and JSON.DEL
- Configure metadata fields properly to support numeric and tag operations
- Support both simple and complex filter expressions
- Handle Redis-specific JSON string responses in tests
- Add comprehensive integration tests for filter deletion cases
This maintains consistency with other vector store implementations while
utilizing Redis Search capabilities for efficient metadata-based deletion.
Signed-off-by: Soby Chacko <soby.chacko@broadcom.com>
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