Rollup merge of rust-lang#98061 - WaffleLapkin:own_the_option, r=joshtriplett

Add `Option::owned`

This PR adds the following public library APIs:
```rust
impl<T: ?Sized> Option<&T> {
    pub const fn owned(self) -> Option<T::Owned>
    where
        T: ~const ToOwned;
}

impl<T: ?Sized> Option<&mut T> {
    pub fn owned(self) -> Option<T::Owned>
    where
        T: ~const ToOwned;
}
```

`Option::owned` is similar to `Option::cloned` and `Option::copied`, but uses the `ToOwned` trait.

---

I thought that would be easier, but since `ToOwned` is defined in the alloc crate this becomes incoherent :')

Author: matthiaskrgr

library/alloc/src/lib.rs

@@ -230,8 +230,10 @@ pub mod collections;
 #[cfg(all(not(no_rc), not(no_sync), not(no_global_oom_handling)))]
 pub mod ffi;
 pub mod fmt;
+pub mod option;
 #[cfg(not(no_rc))]
 pub mod rc;
+pub mod result;
 pub mod slice;
 pub mod str;
 pub mod string;