feat: add dart tasks

[shan-shaji]

What kind of change does this PR introduce? Feature

Did you add tests for your changes? No

If relevant, did you update the documentation? N/A

Summary This PR is still a work in progress and it introduces beginners tasks to learn dart language.

Does this PR introduce a breaking change? Nope

Other information N/A

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[jamesgeorge007]

Oops, accidentally closed along with the Dependabot PRs. @shan-shaji, were you considering moving forward with this? Let me know, and I can re-open :)