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

scripts/build.js

@@ -107,13 +107,15 @@ async function build(target) {
     })
 
     if (extractorResult.succeeded) {
-      // concat additional d.ts to rolled-up dts (mostly for JSX)
-      if (pkg.buildOptions && pkg.buildOptions.dts) {
+      // concat additional d.ts to rolled-up dts
+      const typesDir = path.resolve(pkgDir, 'types')
+      if (await fs.exists(typesDir)) {
         const dtsPath = path.resolve(pkgDir, pkg.types)
         const existing = await fs.readFile(dtsPath, 'utf-8')
+        const typeFiles = await fs.readdir(typesDir)
         const toAdd = await Promise.all(
-          pkg.buildOptions.dts.map(file => {
-            return fs.readFile(path.resolve(pkgDir, file), 'utf-8')
+          typeFiles.map(file => {
+            return fs.readFile(path.resolve(typesDir, file), 'utf-8')
           })
         )
         await fs.writeFile(dtsPath, existing + '\n' + toAdd.join('\n'))