Hide waiting tasks

### Describe your improvement idea or feature request

You can add a wait date to a task, which has the effect of hiding the task from you until that date.

So the app should also do the same by default.

### How would you like to see it implemented?

All waiting tasks are hidden by default
Pending and waiting are two separate entitites (just as they appear when you would run the example command task X where X is the ID of the task)
Also see: https://github.com/CCExtractor/taskwarrior-flutter/issues/337

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### How can we contact you (optional)

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### Would you like to work on this issue?

None

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