Fix typing exports for web SDK

For projects with moduleResolution set to bundler in tsconfig.json, the
types must be exported in the package.json file.

Author: stnguyen90

templates/web/package.json.twig

@@ -8,7 +8,8 @@
   "exports": {
     ".": {
       "import": "./dist/esm/sdk.js",
-      "require": "./dist/cjs/sdk.js"
+      "require": "./dist/cjs/sdk.js",
+      "types": "./types/index.d.ts"
     },
     "./package.json": "./package.json"
   },