Select multiple files in the project navigator

[LeonardoLarranaga]

Description

This pull request adds the ability to select multiple files in the project navigator, having the ability to do the following batch actions:

• Delete
• Duplicate
• New Folder from Selection (where supported)
• Open in Finder
• Open in External Editor
• Open in Tab

Related Issues

• #1706

Checklist

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

Screenshots

https://github.com/user-attachments/assets/ad6e4d64-7123-419a-82a8-42b1b36ebd54

(idk what happened with that latex editor)

[austincondiff]

Great work @LeonardoLarranaga! 🔥🔥🔥 Looking forward to reviewing this one

[austincondiff]

@LeonardoLarranaga Please fix SwiftLint errors