Implement task sorting options

[Valentin-v-Todorov]

• Add --sort flag to ls command with options: priority, created, due, id, text
• Support ascending/descending order with --sort-order asc/desc
• Make sorting preferences persistable in config

[agoritma]

Hi @Valentin-v-Todorov
i willing to work this feature under hacktoberfest, can you assign it to me? thanks

[Valentin-v-Todorov]

Thanks for the contribution @agoritma ! Don't forget to link your PR to the issue ✌️