Automate pull request creation with formatted commits and branch management.

• ›Ensures you're not on the main branch, creating a feature branch if needed
• ›Runs Oxfmt code formatting across all affected packages before committing
• ›Formats commits and PR titles using package name from package.json (e.g., \" @remotion/shapes : Add heart shape\")
• ›Uses the gh CLI to open the pull request automatically after pushing changes