fix(types): augment ref unwrap bail types in appropriate packages

Packages can now augment the ref unwrap bail types in their own `d.ts`.
Also updated the build script to auto concat any files in a package's
`types` directory to the final generated `d.ts`.

- `@vue/reactivity` should no longer require `libs: ["DOM"]` in tsconfig
- Properly bail on `VNode` and `ComponentPublicInstance` in runtime-core

packages/runtime-dom/types/refBail.d.ts

@@ -0,0 +1,8 @@
+// Note: this file is auto concatenated to the end of the bundled d.ts during
+// build.
+
+declare module '@vue/reactivity' {
+  export interface RefUnwrapBailTypes {
+    runtimeDOMBailTypes: Node | Window
+  }
+}