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

## Bevy version

0.10.1

## What you did

Called [`AssetServer::load_folder`](https://docs.rs/bevy_asset/0.10.1/bevy_asset/struct.AssetServer.html#method.load_folder), attempting to validate that all of my assets are loading [as part of a CI check](https://github.com/Leafwing-Studios/Emergence/pull/746).

## 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`](https://docs.rs/bevy_asset/0.10.1/bevy_asset/struct.AssetServer.html#method.get_handle_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.