Feature: Support GitHub tasklists in root node and child milestone issue template

[p-shahi]

GitHub recently released its tasklist feature. I propose that the starmap issue templates support the tasklist syntax for seamless integration with GitHub issues.

Here is the expected syntax https://docs.github.com/en/issues/tracking-your-work-with-issues/about-tasklists#creating-tasklists and rendered output:

Tasks

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[BigLep]

@p-shahi : I think this is a duplicate of #245 (or at least related)

[p-shahi]

Closing this as a duplicate of #245