add method
Adds instance in collection
Also calls MvvmInstance.initialize for this isntance
type - string type of this instance
index - index for this instance
scope - string scope to get instance from
params - params for this instance
Implementation
void add({
required String type,
DefaultInputType? params,
int? index,
String? scope,
}) {
return addWithParams<DefaultInputType>(
type: type, params: params, scope: scope);
}