chore: remove grunt and clean-up (#7845)

* chore: remove grunt files and deps

* chore: npm scripts cleanup

* chore: more deps clean-up

* chore: tsconfig clean-up

* chore: remove unneed file

* chore: move tsinfig.unit-tests

* chore: add dist/ exclude

tns-core-modules/package.json

@@ -20,7 +20,6 @@
     "!node-tests/",
     "!declarations.android.d.ts",
     "!declarations.ios.d.ts",
-    "!gruntfile.js",
     "!org.nativescript.widgets.d.ts"
   ],
   "license": "Apache-2.0",