Build: Enable persistent cache for faster Webpack builds (#41430)

* build(webpack): enable caching for development and production builds

* build(webpack): introduce unminified production build script

* build(typescript): introduce incremental flag to cache typechecking

* chore(git): ignore typescript cache file

* chore(webpack): bump dependencies to latest

tsconfig.json

@@ -7,7 +7,8 @@
     "allowJs": true,
     "strict": true,
     "resolveJsonModule": true,
-    "useUnknownInCatchVariables": false
+    "useUnknownInCatchVariables": false,
+    "incremental": true
   },
   "extends": "@grafana/tsconfig/base.json",
   "include": [