Release 1.2.0

Added

• Introduced a GUI version of dbconvert, including a new dbconvert.gui package and application window.
• Added GUI assets: application icon and logo.
• Added optional dependencies for GUI support.
• Implemented reset and clear output buttons in the GUI.
• Added ASCII logo for CLI.
• Added author and repository links in both CLI and GUI.
• Created custom logging setup for CLI and GUI.

Changed

• Refactored GUI code into a dedicated dbconvert.gui package.
• Enhanced CLI help text and improved user guidance.
• Improved project metadata handling and pyproject metadata extraction.
• Enhanced README with GUI usage details.