chore: improve debugability of fcptrs and vcomponents

this commit changes the fc slot type from a thin pointer to a c pointer.
this lets us provide frame inspection of components using backtrace.

packages/core/src/virtual_dom.rs

@@ -212,7 +212,7 @@ impl VirtualDom {
         let scopes = ScopeArena::new(channel.0.clone());
 
         scopes.new_with_key(
-            root as *const _,
+            root as ComponentPtr,
             Box::new(VComponentProps {
                 props: root_props,
                 memo: |_a, _b| unreachable!("memo on root will neve be run"),