Create a utility for indexing draw calls for dump resources

[davidd-lunarg]

Create a utility for turning dump resource arguments (Nth call to ExecuteCommandLists, Nth CommandList, Nth draw call) into GFXR capture file block indices. If possible make the utility generic enough to work for either Vulkan or DX12. Return a data object which allows lookup of any draw call in the capture file (not just 1)