drain_filter_take

Currently we have the unstable Vec::drain_filter:

pub fn drain_filter<F>(&mut self, filter: F) -> DrainFilter<'_, T, F, A>
where
    F: FnMut(&mut T) -> bool;

My use case is that I want to perform some side effects in filter, where the side effects would determine whether the item should be drained, but performing the side effects requires moving out the T if the element is to be filtered.

I propose a new method drain_filter_take that takes the form

pub fn drain_filter_take<F>(&mut self, filter: F) // does not return an iterator
where
    F: FnMut(T) -> Option<T>;

(I am not sure what a good name would be that clearly indicates it does not return an iterator)

If Some is returned, it replaces the original value; if None is returned, the value is drained. This allows the filter to take ownership of T and only return it if not drained.

Start by reading the existing Vec::drain_filter API and the proposed drain_filter_take signature in this issue. A complete contribution would need the ownership and replacement semantics, method naming, and API design to be resolved before implementation; no files or tests are identified in the issue.