Add full mlx blockwise support - #2233
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MLX blockwise operations fail in non-trivial cases because our implementation isn't a full vectorize, it's just a single naive application of
mlx.vmap. We need to align and broadcast all input shapes, then applyvmaponce per non-core dimension. This is whatjnp.vectorizedoes under the hood. I just went ahead and re-implementedjnp.vectorizein MLX, giving us full vectorize support.Closes #2092 , and also address additional unreported cases (e.g. when data has batch dim).