Add task archiving instead of deletion

[Valentin-v-Todorov]

• Implement tix archive command to soft-delete tasks
• Create tix archived command to view archived tasks
• Allow restoring archived tasks with tix unarchive
• Keep archived tasks in a separate file or marked with archived flag

[JoanJaraBosch]

can yu assign it to me?

[Valentin-v-Todorov]

Thanks for the contribution @JoanJaraBosch ! ✌️