[arch] Integrate Obsidian Tasks as a possible task manager

[caasion]

Obsidian tasks provide robust task management, including description, priority, recurrence, due dates, schedule, dates dependencies statuses creation dates and etc.

Furthermore, obsidian tasks is very well used by many users in Obsidian. Instead of forcing users to migrate off of Obsidian tasks or to run Obsidian Tasks and Holos in parallel, I want to make it so it's also integrated well.

Obsidian Tasks does expose an API: https://publish.obsidian.md/tasks/Advanced/Tasks+Api