Include context in error message cloud_firestore/permission-denied

[jakusb]

Currently if anything fails the security rules, this generic error message is thrown:
Error: [cloud_firestore/permission-denied] Missing or insufficient permissions
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 299:10 createErrorWithStack
dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 341:28 _throw
dart-sdk/lib/core/errors.dart 116:5 throwWithStackTrace
dart-sdk/lib/async/zone.dart 1378:11 callback
dart-sdk/lib/async/schedule_microtask.dart 40:11 _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5 _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 166:15

This message has no hint AT ALL to what query or request was attempted that failed the rules.
This results in a wild goose chase through all code everytime this happens. So much time could be saved by adding some context to what call failed.