feat: add refactor issue template

[tanmaygautam11]

Add refactor issue template

Description

Added a new issue template for refactor requests (refactor_request.md) following the existing project's code style and structure.

Related Issue

Fixes #109

Motivation and Context

The project was missing a dedicated template for refactoring proposals. This template helps contributors clearly articulate refactoring needs and maintains consistency with existing issue templates.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to an existing feature)
• Breaking change (fix or feature that would cause existing functionality to change)
• Test (adds or updates tests only)
• Documentation (non-code change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[Copilot]

Pull Request Overview

This PR adds a new GitHub issue template for refactoring requests to improve the project's issue management structure. The template provides a standardized format for contributors to propose code refactoring initiatives.

• Adds a comprehensive refactor request template with structured sections for current behavior, proposed changes, motivation, and impact assessment
• Includes predefined checkboxes for common refactoring motivations and breaking change indicators
• Follows established GitHub issue template conventions with YAML frontmatter configuration

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

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[archa8]

LGTM!