test: add vitest for unit tests (#50)

* feat: add vitest for unit tests

* chore: address pull request feedback

* test: add unit test code quality workflow

vitest.config.ts

@@ -0,0 +1,23 @@
+import react from "@vitejs/plugin-react";
+import tsconfigPaths from "vite-tsconfig-paths";
+import { configDefaults, defineConfig } from "vitest/config";
+
+export default defineConfig({
+  plugins: [react(), tsconfigPaths()],
+  test: {
+    include: ["**/*.spec.ts"],
+    poolOptions: {
+      threads: {
+        singleThread: false,
+      },
+    },
+    coverage: {
+      provider: "v8",
+      reporter: ["html", "json-summary", "json"],
+      all: true,
+      exclude: ["apps/nextjs/.next/"],
+    },
+
+    exclude: [...configDefaults.exclude, "apps/nextjs/.next"],
+  },
+});