feat: add remove_slice to hir::Type

crates/hir/src/lib.rs

@@ -3224,6 +3224,13 @@ pub fn remove_ref(&self) -> Option<Type> {
         }
     }
 
+    pub fn remove_slice(&self) -> Option<Type> {
+        match &self.ty.kind(Interner) {
+            TyKind::Slice(ty) => Some(self.derived(ty.clone())),
+            _ => None,
+        }
+    }
+
     pub fn strip_references(&self) -> Type {
         self.derived(self.ty.strip_references().clone())
     }