feat : Drag and Drop Functionality for individual Task

[tu2-atmanand]

• When ill hover near the top-right corner of each task item, a handler will get visible, by clicking and dragging that ill able to drag the element wherever i want.

[tu2-atmanand]

I have already added the holder icon for each task in the top right corner for each taks item, visible only on hover. Implement the drag and drop functionality wherein, user will be able to drag the task item from the column, it will be hovering until dropped and this task item can only be dropped based on certain rules.

• TaskItem dragged from Today column, can be dropped into Tomorrow column or completed column, so, if the TaskItem is dropped in Tomorrow column, then the due will be updated from todays to tomorrows date, and if dropped in completed, then the status will be updated to checked. Functionality to drop in Future column can be added, but then the user should be asked about the date.
• Similary, for tagged column, if a TaskItem is dropped from one TagBased Column to another its Tag will be changed accordingly.

The functionalities has been more elaborated here : https://github.com/roovo/obsidian-card-board/issues/11#issue-1040484834