viewership: Differentiate between start and end views in Views API #57
Description
In #51 it's listing startViews, needs to be differentiate in endViews, startViews and views as specified in https://www.notion.so/Expected-viewer-stats-out-of-MistServer-need-refinement-f8c1b8420b3e4be886a2c1d91062d2a5