Spring-ai Fix column creation when adding additional normal and embedding columns, and make index name unique (for when there are multiple vector indexes in the same keyspace)

Fix column creation when adding additional normal and embedding columns, and make index name unique (for when there are multiple vector indexes in the same keyspace). …

And change stream to for-loop when converting List to Float[] for performance

Comment From: tzolov

Thanks @michaelsembwever rebased and merged at daf131be2cc668fe8f1b536b3025dff14e1d231f