✨ Support multiple file and folder drag and drop in the project navigator

[austincondiff]

Is your feature request related to a problem? Please describe.

Users can not drag and drop multiple files and folders

Describe the solution you'd like

Allow the user to select multiple files and folders to drag and drop them in the project navigator.

Additional context

Prerequisites:

• #1018

[jhoogstraat]

I made a draft for this feature over on my fork. This required #1208 to be merged.