feat: Setup Unit Test Environment and Refactor Typescript Config (#365)

* modify tsconfig and set up unit tests

* generate .d.ts files

* setup project dependencies and configuration for unit tests

* Add test setup and layout-test-utils along with first spec

* Add paths back to tsconfig

* remove type=module from package.json

* Add typescript definition for .env

* update package-lock

client/tsconfig.node.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "module": "ESNext",
+    "moduleResolution": "Node",
+    "allowSyntheticDefaultImports": true
+  },
+  "include": ["vite.config.ts"]
+}