Added support for node 16, formatting and linting (fluent-ui) (#2938)

* Added support for node 16, formatting and linting
- Regenerated the `package-lock.json` file with node-16
  - Also added packages to support linting
- Added the `cs-check`, `cs-format` and `lint` scripts along with `lint-staged` to the `package.json` file
- Ran `eslint --fix` and `cs-format` over the `src` and `test` directories to fix the build
- Added a slight adaptation of the `.eslintrc` file from `core` to this package

* - Fix build, hopefully

packages/fluent-ui/.eslintrc

@@ -0,0 +1,37 @@
+{
+  "parser": "@typescript-eslint/parser",
+  "rules": {
+    "react/jsx-uses-react": 2,
+    "react/jsx-uses-vars": 2,
+    "react/react-in-jsx-scope": 2,
+    "react/jsx-tag-spacing": [1, {
+      "beforeSelfClosing": "always"
+    }],
+    "curly": [2],
+    "linebreak-style": [2, "unix"],
+    "semi": [2, "always"],
+    "comma-dangle": [0],
+    "@typescript-eslint/no-unused-vars": [2, {
+      "vars": "all",
+      "args": "none",
+      "ignoreRestSiblings": true
+    }],
+    "no-console": [0],
+    "object-curly-spacing": [2, "always"],
+    "keyword-spacing": ["error"],
+    "no-prototype-builtins": "warn",
+    "@typescript-eslint/no-empty-function": "warn",
+    "@typescript-eslint/no-var-requires": "warn"
+  },
+  "env": {
+    "es6": true,
+    "browser": true,
+    "node": true
+  },
+  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  "plugins": [
+    "@typescript-eslint",
+    "jsx-a11y",
+    "react"
+  ]
+}