feat(main.ts): implement loadSettings and saveSettings methods to manage plugin settings
feat(main.ts): create AutoBulletSettingTab to provide a user interface for settings
feat(manifest.json): add hasSettings property to indicate the plugin has configurable settings
feat: implement auto bullet insertion feature when typing space or tab at the beginning of a line
feat: add toggle functionality to enable/disable auto bullet feature via ribbon icon and status bar
refactor: clean up code by removing unused sample modal and commands
fix: update settings tab to reflect new plugin name and functionality
