chore: export access control interface (#3)

This PR exports `IAccessControlDispatcher` and `IAccessControlDispatcherTrait`
 for less verbose imports.

src/lib.cairo

@@ -1,6 +1,6 @@
 mod access_control;
 
-use access_control::access_control_component;
+use access_control::{access_control_component, IAccessControlDispatcher, IAccessControlDispatcherTrait};
 #[cfg(test)]
 mod tests {
     mod mock_access_control;