WIP: Add change log and migration guide entries.

PyO3 · Dec 19, 2023 · 50fcc2a · 50fcc2a
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+The `Iter(A)NextOutput` types are now deprecated and `__(a)next__` can directly return anything which can be converted into Python objects, i.e. awaitables do not need to be wrapped into `IterANextOutput` or `Option` any more. `Option` can still be used as well and returning `None` will trigger the fast path for `__next__`, stopping iteration without having to raise a `StopIteration` exception.