 Refactor codebase to async/await - `m365 planner bucket` & `m365 planner plan`

This issue is for the refactoring of the `m365 planner commands` commands, more specifically:

- m365 planner bucket add
- m365 planner bucket get
- m365 planner bucket list
- m365 planner bucket remove
- m365 planner bucket set
- m365 planner plan add
- m365 planner plan get
- m365 planner plan list
- m365 planner plan remove
- m365 planner plan set