Custom Index added for each tasks to support multiple tasks in same row

[apar-adhikari]

In order to allow multiple tasks to be allowed in a single row, custom_index can be added to the task object.

[safwansamsudeen]

Thanks! Please remove the package.json changes. Also, could you add an example?

[safwansamsudeen]

If you resolve the conflicts, we can merge this. Thanks!