chore: add GitHub templates and CODEOWNERS

[Cheffromspace]

Description

This PR adds GitHub project templates and configuration files to improve collaboration and code review processes.

Type of Change

• 🔧 Configuration change

Changes Made

• Added pull request template with comprehensive checklist
• Configured CODEOWNERS file to require appropriate reviews for different parts of the codebase
  • Global ownership for engineering team
  • Special requirements for workflows, CI/CD, dependencies, and documentation

Benefits

• Standardized pull request format for better communication
• Automatic reviewer assignment based on file changes
• Clear expectations for PR submissions
• Improved code review process

Notes

This is the first step in setting up our CI/CD pipeline. Future PRs will add:

• GitHub Actions workflows for CI
• Security scanning and dependency management
• Automated release process