Add support for sub-tasks

[mossadacity]

Would it be possible to add subtask syncing?

For example:

• Task #todoist
  • Subtask 1 #todoist
  • Subtask 2 #todoist

Picture of subtasks in Todoist:

I understand this would require parsing multiple lines of the Obsidian notes, and looks like a substantial rewrite - maybe like work needed for #26 . Would happily contribute money towards development on this feature.

Thank you for an excellent plugin!