feat(sfc): allow sfcs to recursively self-reference in template via name inferred from filename

e.g. A file named `FooBar.vue` can refer to itself as `<FooBar/>`. This gets rid of the need for the `name` option.

packages/runtime-core/src/helpers/resolveAssets.ts

@@ -67,6 +67,12 @@ function resolveAsset(
 
     // self name has highest priority
     if (type === COMPONENTS) {
+      // special self referencing call generated by compiler
+      // inferred from SFC filename
+      if (name === `_self`) {
+        return Component
+      }
+
       const selfName =
         (Component as FunctionalComponent).displayName || Component.name
       if (