This crate provides a derive macro for the AssetManager trait.
# Example
```rust
use derive_asset_container::AssetManager;
#[derive(Clone, AssetManager)]
#[asset(asset(TestAsset))]
struct Struct {
field: TestAsset,
inner: InnerStruct,
}
#[derive(Clone, AssetManager)]
#[asset(asset(TestAsset), lazy)]
struct InnerStruct {
field: TestAsset,
}
```