include method
Adds a reference to import from another file
Implementation
void include(String filename, String name) {
filename += '.generated.dart';
name = validName(name, firstCapital: true);
container.includes[filename] ??= <String>[];
if (!container.includes[filename]!.contains(name)) {
container.includes[filename]!.add(name);
container.includes[filename]!.sort();
}
}