Equivalent method to next_chunk?

[wmstack]

It would be nice for ArrayVec to have an ergonomic method to take out N elements of an iterator. This would be analogous to the next_chunk iterator method, which however never produces an error, as if there is not enough elements to fill out the whole capacity of the ArrayVec, the length can be smaller to accomodate that.

The result is a simpler type ArrayVec<T, N> rather than a Result<[T; N], IntoIter<T, N>> returned by next_chunk.

Proposal:

// N becomes the capacity of the ArrayVec
let arr_vec = ArrayVec::take_from_iter::<N>(iter);

// alternatively an iterator method to extract at most N elements
let arr_vec = iter.next_array::<N>()

What do you think?