feat: add drag and drop feature

[iMeaNz]

Objective

The user should be able to use drag and drop to interact with the asset manager, wheter it is to import, or to use assets.

Acceptance Criteria

• 1. The user should be able to drag and drop file from file explorer into the asset manager (see if it is possible with ImGui)
• 2. The user should be able to drag and drop a model into a scene using the EditorScene or SceneTreeWindow
• 3. The user should be able to drag and drop a texture onto an entity in the EditorScene or SceneTreeWindow and then choose the type of texture to apply (albedo, specular, normal etc...)

Dependencies

No response

Technical Details

No response

Type

Editor

[Thyodas]

@jcardonne Use this to learn imgui (there is an example of drag and drop inside)
https://pthom.github.io/imgui_manual_online/manual/imgui_manual.html