Drag and drop add asset to assets panel

[itsdouges]

To easily add assets to a project you should be able to drag and drop them into Triplex and have them added to the assets panel using the config implemented from https://github.com/try-triplex/triplex/issues/91

Use cases:

1. Drag and drop asset into Triplex
2. Asset gets added to the /public folder

[itsdouges]

@krispya can I get your thoughts on this issue please

[krispya]

All I would add to this is being able to drop them into specific folders inside the asset panel would be key for complex workflows.