Adding basing setup for eslint

package.json

@@ -21,6 +21,8 @@
     "test:docker": "./test/test_under_docker.sh",
     "test:python": "sandbox_venv3/bin/python sandbox/grist/runtests.py ${GREP_TESTS:+discover -p \"test*${GREP_TESTS}*.py\"}",
     "cli": "NODE_PATH=_build:_build/stubs:_build/ext node _build/app/server/companion.js",
+    "lint": "eslint .",
+    "lint:fix": "eslint --fix .",
     "generate:translation": "NODE_PATH=_build:_build/stubs:_build/ext node buildtools/generate_translation_keys.js"
   },
   "keywords": [
@@ -34,6 +36,8 @@
   },
   "private": false,
   "devDependencies": {
+    "@babel/core": "7.18.5",
+    "@babel/eslint-parser": "7.18.2",
     "@types/accept-language-parser": "1.5.2",
     "@types/backbone": "1.3.43",
     "@types/chai": "4.1.7",
@@ -71,12 +75,15 @@
     "@types/uuid": "3.4.4",
     "@types/which": "2.0.1",
     "@types/ws": "^6",
+    "@typescript-eslint/eslint-plugin": "5.29.0",
+    "@typescript-eslint/parser": "5.29.0",
     "app-module-path": "2.2.0",
     "catw": "1.0.1",
     "chai": "4.2.0",
     "chai-as-promised": "7.1.1",
     "chance": "1.0.16",
     "esbuild-loader": "2.19.0",
+    "eslint": "8.18.0",
     "http-proxy": "1.18.1",
     "i18next-scanner": "4.1.0",
     "jsdom": "16.5.0",