Introduced tsconfig.app.json and tsconfig.base.json + Refactored eslint.config.js to the latest structure (#652)

* Introduced tsconfig.app.json and tsconfig.base.json

* yarn.lock

* Introduced tsconfig.app.json, tsconfig.base.jsonfig.

* Refactored eslint.config.js to latest structure

* Returned previous recommended rules.

* More rules

* Force import rules

* Check

* Check

* Cleanup ESLint configuration and plugins

* Cleanup heap: "writable",DD_RUM: "writable" from ESLint configuration

* "scripts" moved to the top of package.json

frontend/tsconfig.json

@@ -1,27 +1,7 @@
 {
-  "compilerOptions": {
-    "target": "ESNext",
-    "useDefineForClassFields": true,
-    "lib": ["DOM", "DOM.Iterable", "ESNext"],
-    "allowJs": false,
-    "skipLibCheck": true,
-    "esModuleInterop": false,
-    "allowSyntheticDefaultImports": true,
-    "strict": true,
-    "forceConsistentCasingInFileNames": true,
-    "module": "ESNext",
-    "moduleResolution": "bundler",
-    "resolveJsonModule": true,
-    "isolatedModules": true,
-    "noEmit": true,
-    "jsx": "react-jsx"
-  },
-  "include": [
-    "src",
-    "public/static",
-    ".storybook/**/*.ts",
-    "public/analytics.js",
-    "cypress"
-  ],
-  "references": [{ "path": "./tsconfig.node.json" }]
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
 }