fix: add typescript 5 compatible types field (#2062)

* fix: add typescript 5 compatible types field

Typescript 5 appears to require a "types" entry in each
exports entry even though there is a "types" entry at the
root of the package.json

* fix: types path must be relative

Author: chriscasola

packages/test-utils/package.json

@@ -6,6 +6,7 @@
   "module": "dist/vue-test-utils.esm.js",
   "exports": {
     ".": {
+      "types": "./types/index.d.ts",
       "require": "./dist/vue-test-utils.js",
       "import": "./dist/vue-test-utils.esm.js",
       "default": "./dist/vue-test-utils.js"