Create pull_request_template.md

Provide a PR template to expedite both internal and external contributions.

.github/pull_request_template.md

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+## Description
+
+<!--
+Describe what this PR changes or adds. Include any relevant context or motivation.
+-->
+
+## Related Issues
+
+- [ ] **Please link to a relevant GitHub issue for additional context.**
+  - **Bug Fix:** Link to an issue that includes reproduction steps and testing guidance.
+  - **Feature/Enhancement:** Link to an issue with a write-up, rationale, and requirements.
+
+Issue Link: <!-- e.g., closes #123 or relates to #456 -->
+
+---
+
+## Checklist
+
+Please ensure the following before requesting review:
+
+- [ ] I have provided a clear title and detailed description for this pull request.
+- [ ] The PR is linked to a relevant issue with sufficient context (see above).
+- [ ] I have tested the changes locally and verified they work as intended.
+- [ ] All new and existing tests pass (if applicable).
+- [ ] Code follows the project's style guidelines.
+- [ ] Documentation (if needed) has been updated.
+- [ ] Any dependent changes have been merged and published in downstream modules
+- [ ] I have reviewed the [contributing guidelines](../CONTRIBUTING.md).
+
+---
+
+## Additional Notes
+
+<!--
+Add any other information, screenshots, or suggestions for reviewers here.
+-->