[Board] Show parent task and subtask relationship like Gingko

We have introduced a new feature called Task Bundle, which allows you to group the subtasks under their parent tasks so the task hierarchy will be preserved as it is. Check out this blog post for more information! 😃

Note: This feature is only available for Professional, Premium, and Enterprise subscriptions.

@wilsonfoz - thank you for your feedback. I have passed this suggestion to our team.

p.s. I have edited the name of this feedback, making it easier for other users to search for similar feedback and vote up! Hope you don't mind 🙌