Refactor pull request template and add checklist

.github/PULL_REQUEST_TEMPLATE.md

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+# Pull Request Title (short and descriptive)
+
+## Description
+Provide a brief summary of the changes made in this pull request.
+
+## Type of Change
+Please delete options that are not relevant and mark the one that applies:
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Refactoring (code improvements or updates without changing functionality)
+
+## Related Issue(s)
+List any related issues:
+- Closes #ISSUE_ID
+
+## Proposed Solution
+Describe the approach taken to implement the solution.
+
+## Checklist
+Please review the checklist below and mark items as complete as applicable:
+- [ ] My code follows the style guidelines of this project.
+- [ ] I have performed a self-review of my code.
+- [ ] I have commented my code, particularly in hard-to-understand areas.
+- [ ] I have added necessary unit tests that verify the functionality.
+- [ ] All new and existing tests pass locally.
+- [ ] I have checked that no other open PRs address this issue.
+
+## Screenshots (if applicable)
+Include any screenshots or additional visual aids that might help with the review.
+
+## Additional Information
+Add any other context about the pull request here.