Added npm run fix to fix ESLint errors (#7337)

This is the most helpful command I have figured out so far.

Let me know if there is a better way to fix formatting errors, e.g. an
auto-formatting tool you use.

package.json

@@ -33,6 +33,9 @@
     "check:style": "run-p check:style:*",
     "check:style:scss": "stylelint \"src/**/*.scss\"",
     "check:style:ts": "eslint --cache \"src/**/*.ts\"",
+    "fix": "run-p fix:*",
+    "fix:style": "run-p fix:style:*",
+    "fix:style:ts": "eslint --cache \"src/**/*.ts\" --fix",
     "start": "ts-node -T tools/build --verbose --all --dirty --watch",
     "upgrade": "run-s upgrade:*",
     "upgrade:bump": "ncu --upgrade --filterVersion \"/^\\^/\"",