girder_client: Easier mocking moving progress IO wrapper as top-level classes
girder_client: Easier mocking moving progress IO wrapper as top-level classes

Suggested-by: "zach.mullen" <789a6e3f500c47b347713d1eb17ac7f49131736c@kitware.com>

girder/girder,Xarthisius/girder,kotfic/girder,manthey/girder,sutartmelson/girder,jbeezley/girder,RafaelPalomar/girder,data-exp-lab/girder,RafaelPalomar/girder,girder/girder,manthey/girder,jbeezley/girder,jbeezley/girder,manthey/girder,Xarthisius/girder,Kitware/girder,Xarthisius/girder,adsorensen/girder,Kitware/girder,manthey/girder,sutartmelson/girder,adsorensen/girder,adsorensen/girder,sutartmelson/girder,data-exp-lab/girder,sutartmelson/girder,Kitware/girder,Xarthisius/girder,RafaelPalomar/girder,kotfic/girder,data-exp-lab/girder,kotfic/girder,RafaelPalomar/girder,adsorensen/girder,girder/girder,RafaelPalomar/girder,Kitware/girder,jbeezley/girder,girder/girder,kotfic/girder,Xarthisius/girder,kotfic/girder,sutartmelson/girder,data-exp-lab/girder,adsorensen/girder,data-exp-lab/girder