Tracking issue for planned breaking changes:

[sosthene-nitrokey]

• Rework re-exports in lib.rs Implement DequeView on top of #486 #490 (comment)
• Rename Deque::storage_len to len: Implement DequeView on top of #486 #490 (comment)
• Remove the Storage generic on binary_heap::OldestOrdered. The view version can become the version that is always used.
• Queue::capacity and Queue::storage_capacity should be changed
• spsc: The iterators, consumers and producers should be made to only have the View variants
• SortedLinkLinst: Iter and FindMut should be made to only exist in the View version.
• Vec: rename storage_capacity to capacity and remove the const version