btree: add `{Entry,VacantEntry}::insert_entry`
This matches the recently-stabilized methods on `HashMap` entries. I've
reused tracking issue #65225 for now, but we may want to split it.
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|---|---|---|
| .. | ||
| binary_heap | ||
| btree | ||
| linked_list | ||
| vec_deque | ||
| linked_list.rs | ||
| mod.rs | ||