chore(eslint): Add react/jsx-key lint rule

Rule is set to error.
option checkFragmentShorthand option set to true,  meaning the rule is used for shorthand fragment syntax too.
option will default to true next major eslint-plugin-react version

See rule docs [here](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-key.md)

.eslintrc

@@ -15,6 +15,7 @@
     "sourceType": "module"
   },
   "rules": {
+    "react/jsx-key": ["error", { "checkFragmentShorthand": true }],
     "@typescript-eslint/ban-types": "off",
     "@typescript-eslint/ban-ts-comment": "off",
     "@typescript-eslint/explicit-module-boundary-types": "off",