[feature] DownloadDependencies using any keys as argument

workaround: in AddressablesImpl.cs DownloadDependenciesAsync(...):

Code (CSharp):

1.             IList<IResourceLocation> locations;
2.             switch (key) { //**addressables - keys as locations support (just like GetDownloadSize/LoadAsset allow)
3.                 case IList<IResourceLocation> locationsList:
4.                     locations = locationsList;
5.                     break;
6.                 case IResourceLocation location: locations = new List<IResourceLocation>(1) { location };
7.                     break;
8.                 default: {
9.                     if (!GetResourceLocations(key, out locations))
10.                         return ResourceManager.CreateCompletedOperation<IList<IAssetBundleResource>>(null, new InvalidKeyException(key).Message);
11.                     break;
12.                 }
13.             }
14.