load method
Reads bytes, choosing the dialect the same way isBinaryStl does.
No resolveUri parameter: a .stl file is always one self-contained
blob, unlike glTF's buffers or OBJ's material library.
Implementation
Future<ModelDocument> load(Uint8List bytes) async =>
isBinaryStl(bytes) ? _decodeBinary(bytes) : _decodeAscii(bytes);