78dae46521
Stabilize map_first_last
Stabilizes the following functions:
```Rust
impl<T> BTreeSet<T> {
pub fn first(&self) -> Option<&T> where T: Ord;
pub fn last(&self) -> Option<&T> where T: Ord;
pub fn pop_first(&mut self) -> Option<T> where T: Ord;
pub fn pop_last(&mut self) -> Option<T> where T: Ord;
}
impl<K, V> BTreeMap<K, V> {
pub fn first_key_value(&self) -> Option<(&K, &V)> where K: Ord;
pub fn last_key_value(&self) -> Option<(&K, &V)> where K: Ord;
pub fn first_entry(&mut self) -> Option<OccupiedEntry<'_, K, V>> where K: Ord;
pub fn last_entry(&mut self) -> Option<OccupiedEntry<'_, K, V>> where K: Ord;
pub fn pop_first(&mut self) -> Option<(K, V)> where K: Ord;
pub fn pop_last(&mut self) -> Option<(K, V)> where K: Ord;
}
```
Closes #62924
~~Blocked on the [FCP](https://github.com/rust-lang/rust/issues/62924#issuecomment-1179489929) finishing.~~ Edit: It finished!
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