bevy
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implement DoubleEndedIterator for QueryManyIter
Objective
We currently cannot iterate from the back of QueryManyIter.
Solution
Implement DoubleEndedIterator for QueryManyIter and add a fetch_next_back method. These impls are bounded on the underlying entity_iter implementing DoubleEndedIterator.
Changelog
Added DoubleEndedIterator implementation for QueryManyIter.
Added the fetch_next_back method to QueryManyIter.