invoke method
The low-level escape hatch: invoke any raw t.TlMethod (from
the tl library) that ptgc doesn't have a typed wrapper for yet.
Handles DC migration and error translation just like every other
method in this package.
Implementation
Future<t.TlObject> invoke(t.TlMethod method) {
return callRaw<t.TlObject>(() => raw.invoke(method));
}