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573def7cd8
Accept the Cassandra SAI 'source_model' option for vector indexes.
This option is used by Cassandra libraries (e.g., CassIO, LangChain)
to tag vector indexes with the name of the embedding model that
produced the vectors.
ScyllaDB does not use the source_model value but stores it and
includes it in the DESCRIBE INDEX output for Cassandra compatibility.
Additionally, extend vector_index::describe() to emit a
WITH OPTIONS = {...} clause containing all user-provided index options
(filtering out system keys: target, class_name, index_version).
This makes options like similarity_function, source_model, etc.
visible in DESCRIBE output.