Allow changing the TAB shortcut for complete to something else like CTRL+TAB to allow TAB to... well TAB in

[GarethBlain]

As it stands currently if you want to be able to hold the Option key to view the full preview you have to enable "Accept suggestions with Tab" from the Advanced Copilot for Xcode Settings. Doing this however makes actual Tabs impossible to do as tabbing with the tab key will always accept the suggestion.
We already have options in Xcode to accept suggestions with Copilot (mine has been changed to CTRL + TAB but it doesn't stop Tab being used as well).
If you disable the "Accept suggestions with Tab" option then it does fix the TAB override and you can still accept the full option but the Option key will no longer show the full suggestion and therefore you can't accept it with Option + TAB.

Ideas to solve this would be to have either the option to show/accept full suggestions being separated from the tab option or maybe option in Copilot's Setting to change the Tab shortcut to something else (ideally user selectable but at least something like CTRL + TAB).