all: split reusable components into workspace crates

src/utils/opaque_cell.rs

@@ -1,28 +0,0 @@
-use std::{
-    cell::Cell,
-    fmt::{Debug, Formatter},
-    ops::{Deref, DerefMut},
-};
-
-#[derive(Default)]
-pub struct OpaqueCell<T>(Cell<T>);
-
-impl<T> Deref for OpaqueCell<T> {
-    type Target = Cell<T>;
-
-    fn deref(&self) -> &Self::Target {
-        &self.0
-    }
-}
-
-impl<T> DerefMut for OpaqueCell<T> {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
-    }
-}
-
-impl<T> Debug for OpaqueCell<T> {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(f, "Cell<{}> {{ ... }}", std::any::type_name::<T>())
-    }
-}