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

### Put here any screenshots or videos (optional)

_No response_

### How can we contact you (optional)

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

None

### By submitting this issue, I have confirmed that:

- [x] I have starred the repo ⭐ and watched 👀 it on GitHub and followed the contribution guidelines.

まずタスクのフィルタリングとリスト表示のエントリポイントを確認し、次に待機中のタスクに関する文脈を把握するため、関連する issue #337 を読みます。保留中のタスクと待機中のタスクがどのように表現されているかを確認し、保留中のタスクは表示したまま、待機中のタスクをデフォルトで非表示にして、アプリのタスクリストで動作を検証します。

索引モデルが issue の本文から書いたものです。