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Add vmap for BroadcastAxes - #3344
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A simplified and correct version of #3319. The main point is that it moves the batch axis first and takes advantage of the BroadcastAxes primitive's negative axes handling (which was made for this tbh) to avoid all axis math. Unfortunately we may need to expand to move the vectorized axis first if the dims are smaller.
In addition to the above it makes sure that the BroadcastAxes primitive is used even when it is a noop to have a consistent graph that works all the time. Basically dealing with the broadcast version of #3202.