[rollup] Include typescript definitions in build

Emit our TypeScript definitions as well in the build so things like options have 
typechecking

compiler/packages/babel-plugin-react-forget/rollup.config.js

@@ -17,6 +17,7 @@ export default {
   },
   plugins: [
     typescript({
+      tsconfig: "./tsconfig.json",
       compilerOptions: {
         noEmit: true,
       },

compiler/packages/babel-plugin-react-forget/tsconfig.json

@@ -3,6 +3,8 @@
   "compilerOptions": {
     "moduleResolution": "nodenext",
     "declaration": true,
+    "declarationDir": "./dist",
+    "declarationMap": true,
     "rootDir": "src",
     "outDir": "dist",
     // https://github.com/microsoft/TypeScript/issues/30925