Add issue templates (#16213)
Follows https://github.com/astral-sh/ruff/pull/15651
Preview: https://github.com/dhruvmanila/ruff-issue-templates/issues
GitHub made the interface for single-template repositories worse. While
they might fix it, it encouragement to just do this work. They still
haven't fixed the teeny tiny emojis which makes me think this won't be
fixed quickly.
Before:
<img width="1267" alt="Screenshot 2025-02-17 at 8 26 08 AM"
src="https://github.com/user-attachments/assets/e69ef630-4296-470e-ab4d-a22d55785444"
/>
After:
<img width="1688" alt="Screenshot 2025-02-24 at 3 05 35 PM"
src="https://github.com/user-attachments/assets/61033666-1fe5-421b-a69c-1aa79bcc85b5"
/>
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Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>
