Adds shortcuts for creating tabs, reorganizing tabs, and moving the focus.
Adds multiple shortcuts to manage tabs:
Opens a tab in the same group as the current tab.
Mac: Command+Shift+Y
Windows: Ctrl+Shift+Y
Swap the tab to the left, moving into and out of tab groups.
Swap the tab to the right, moving into and out of tab groups.
Move focus to the left, moving into and out of tab groups.
Move focus to the right, moving into and out of tab groups.
