Replicate TH1::SetOption to TGraph

There has been a request on the forum (https://root-forum.cern.ch/t/setoption-method-in-tgraph-tgrapherrors/27141) to add functionality to TGraph matching that provided with TH1:SetOption. This would permit the user to set the default drawoption without drawing the graph prior to returning the object to the end user.

TGraph::SetDrawOption requires that the object is drawn first, perhaps this can be changed so that it sets the default behavior instead.