chore(github): add issue forms and pr template (#566)

.github/pull_request_template.md

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+## Summary
+
+<!-- What does this PR change and why? -->
+
+## Related Issue(s)
+
+<!-- e.g. Closes #123 -->
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation
+- [ ] Refactor
+- [ ] Other
+
+## Validation
+
+<!-- How did you verify this change? -->
+
+## Checklist
+
+- [ ] I ran relevant checks/tests locally.
+- [ ] I updated docs if behavior or interfaces changed.
+- [ ] I verified there are no unrelated changes in this PR.