[data.llm] Return a batch of rows in the udf instead of row by row #54329
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As mentioned in this PR there is a lot of overhead when returning each row as its own batch with bsize=1 in an async generator udf. This PR fixes is by returning a batch.
There is an argument that we are sacrificing throughput by making items in a batch sync but that there is even a bigger overhead now because of yielding each at row levels.