AssetServer::load_folder does not return enough information to be useful

[alice-i-cecile]

Bevy version

0.10.1

What you did

Called AssetServer::load_folder, attempting to validate that all of my assets are loading as part of a CI check.

What went wrong

Rather than receiving any identifying information about the nature of these handles (such as the asset loader used, or their path), it's a vec with no additional metadata.

Additional information

Users can then use these handles in AssetServer::get_load_path to retrieve the metadata.

This is not obvious to do: handles need to be categorized immediately upon storage to be useful for most workflows.

[viridia]

Now that we have LoadedWithDependencies, dealing with loaded folders may be more tractable.

[RyeToastyO]

This feels related to #2291 but not exactly the same.
Having better information and control over asset loading would be great!