keyboard shortcut for tab switching

[knotbin]

Description

The following keyboard shortcuts are now implemented:
CMD + SHIFT + ] to go to the next tab or, if the user is on the last tab, wrap around to the first tab
CMD + SHIFT + [ to go to the previous tab or, if the user is on the first tab, wrap around to the last tab

Related Issues

• closes ✨ ⇧⌘[ and ⇧⌘] keyboard shortcuts to cycle between editor tabs in the active editor #1658

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

[austincondiff]

Thanks for the fantastic work! There are a few small adjustments we need to make in order to merge this.

These keyboard shortcuts should probably be associated with menu items instead of empty buttons...

• Navigate > Show Previous Tab
• Navigate > Show Next Tab

These currently exist but are disabled so all you should need to do is hook them up to the functions you wrote.

We also need to make sure that this is only applied to the focused editor and not applied to all open editors if the user has a split editor layout.

[knotbin]

Thanks so much for all the feedback and sorry for the incredibly janky initial workaround. I just fixed the menu bar implementation by adding an extension to the editor with the functions I made and using those in the NavigateCommands. Because NavigateCommands uses @FocusedObject, it only tabs the focused split now. Tell me if you want anything else changed or fixed and thanks again for the feedback.

[austincondiff]

Looks good to me! ✅

Edit: Please fix the SwiftLint errors.

[knotbin]

SwiftLint errors all fixed 👍

[austincondiff]

@allcontributors add @knotbin for code

[allcontributors]

@austincondiff

I've put up a pull request to add @knotbin! 🎉