Make hydration diff more precise

[huang-julien]

Describe the feature

While Vue doesn't provide onMismatched hook yet, we're relying on onMounted hook.

Sometime, it creates false positives when there's no hydration mismatch.

TODO:

• investigate how we can compare first render and SSR more precisely
• make attribute comparison more precise
  • ignore white spaces

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.