Add editor integration to open generated code files

[SL-Mar]

Summary

This PR adds the ability to automatically open generated QuantConnect code files in the user's preferred editor. Users can now use the --open-in-editor flag with the generate command to launch the code in their configured editor.

Key Changes

• New CLI options: Added --open-in-editor flag and --editor option to the generate command

  • --open-in-editor: Opens the generated code file in an editor after successful generation
  • --editor: Allows overriding the default editor (e.g., zed, code, vim)

• New editor module (quantcoder/editor.py):

  • open_in_editor(): Launches a file in the specified editor with proper error handling
  • get_editor_display_name(): Provides friendly display names for common editors

• Configuration updates:

  • Added editor field to UIConfig with default value of "zed"
  • Updated config serialization to include the new editor setting

• Enhanced user experience:

  • Provides feedback when editor is successfully opened
  • Shows helpful warning if editor is not installed
  • Non-blocking editor launch using subprocess

Implementation Details

• Editor detection uses shutil.which() to verify editor availability in PATH
• Editor process is launched non-blocking with subprocess.Popen() and start_new_session=True to prevent blocking the CLI
• Comprehensive error handling for missing files and unavailable editors
• Supports common editors: Zed, VS Code, Vim, Neovim, Nano, Sublime Text, Atom, and Emacs