chore: import upstream snapshot with attribution

.github/pull_request_template.md

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+## Description
+<!-- Provide a clear and concise description of what this PR accomplishes -->
+Write here.
+
+## Related Issue(s)
+<!-- Link to the issue that this PR addresses (if applicable) -->
+Fixes #(issue number)
+
+## Review Guidance
+<!-- Provide any additional information that would help reviewing your work -->
+Write here.
+
+## Screenshots/GIFs
+<!-- If applicable, add screenshots or GIFs demonstrating the changes -->
+Write here.
+
+## Checklist
+<!-- Mark items with 'x' (no spaces around x) -->
+- [ ] My code follows the project's code style guidelines
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have updated the documentation accordingly
+- [ ] My changes don't generate new warnings or errors
+- [ ] No unsafe code introduced (or if introduced, thoroughly justified and documented)