build: enforce 80% test coverage on changed files via husky

package.json

@@ -8,7 +8,8 @@
   "scripts": {
     "build": "webpack --mode production",
     "deploy": "clasp push",
-    "test": "jest"
+    "test": "jest",
+    "prepare": "husky"
   },
   "devDependencies": {
     "@types/google-apps-script": "^1.0.85",
@@ -16,7 +17,9 @@
     "copy-webpack-plugin": "^13.0.1",
     "gas-webpack-plugin": "^2.6.0",
     "graphql-tag": "^2.12.6",
+    "husky": "^9.1.7",
     "jest": "^29.7.0",
+    "lint-staged": "^16.2.7",
     "shopify-admin-api-typings": "github:beepmill/shopify-admin-api-typings",
     "ts-jest": "^29.4.6",
     "ts-loader": "^9.5.1",