[REQ] More informative error message for `bsr_mv`

[itsvismay]

Bug Description

A more informative error message here would be nice. It would be nice to know the shapes and ncols and block types of the mismatching arrays.

System Information

No response

[gdaviet]

Note that since Warp 1.7.x this code should no longer throw an error (the vec should get automatically reshaped). The req about getting a more informative message when reshaping is not possible is still valid though