Remove the stack map registry.

This commit removes the stack map registry and instead uses the existing
information from the store's module registry to lookup stack maps.

A trait is now used to pass the lookup context to the runtime, implemented by
`Store` to do the lookup.

With this change, module registration in `Store` is now entirely limited to
inserting the module into the module registry.

crates/runtime/src/instance/allocator/pooling/uffd.rs

@@ -523,7 +523,7 @@ mod test {
                                 host_state: Box::new(()),
                                 interrupts: ptr::null(),
                                 externref_activations_table: ptr::null_mut(),
-                                stack_map_registry: ptr::null_mut(),
+                                stack_map_lookup: None,
                             },
                         )
                         .expect("instance should allocate"),