feat: add OccupiedEntry::insert_before
method
#24
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Motivation
Add a method that enables us to insert elements in the middle of the underlying linked-list. Initial discussion is in #23.
In this PR
Following our discussion, I've implemented the
OccupiedEntry::insert_before
method. It may seem ad hoc, but it's functioning as expected.I'm open to further discussions about a more general API. This PR is primarily for tracking progress, not necessarily for immediate merging.