feat: enhance PR template for Solidity project

[AdekunleBamz]

Description

Enhanced the PR template with comprehensive sections tailored for Solidity smart contract development.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring

Changes Made

PR Template Enhancement

• Added Type of Change section with categories (bug fix, feature, breaking change, docs, performance, refactoring)
• Added Testing checklist with smart contract specific items:
  • Gas optimization verification
  • Slither static analysis passed
  • Forge fmt applied
• Added comprehensive checklist for code quality and security:
  • Event emissions verified
  • Code style guidelines
  • Comment requirements
• Added Related Issues section for better issue tracking

Testing

• Unit tests pass
• Integration tests pass
• Manual testing completed
• Gas optimization verified (for smart contract changes)
• Slither static analysis passed
• Forge fmt applied

Checklist

• Code follows the project's style guidelines
• Self-review of code completed
• Code is commented, particularly in hard-to-understand areas
• Corresponding changes to documentation made
• No new warnings introduced
• Tests added that prove the fix is effective or feature works
• New and existing unit tests pass locally
• Event emissions verified

Additional Notes

• Template follows Solidity smart contract development best practices
• Includes security-focused items (Slither, gas optimization)
• Compatible with Foundry/Forge workflow

Related Issues

Link to related issues (e.g., Fixes #123)