ENH: added rendering benchmark

Examples/RenderingBenchmark/CMakeLists.txt

Examples/RenderingBenchmark/RenderingBenchmark.cpp

...erer/RenderDelegate/imstkVulkanLineMeshRenderDelegate.cpp

...nderer/RenderDelegate/imstkVulkanLineMeshRenderDelegate.h

...lkanRenderer/RenderDelegate/imstkVulkanRenderDelegate.cpp

...r/RenderDelegate/imstkVulkanSurfaceMeshRenderDelegate.cpp

Source/Rendering/VulkanRenderer/imstkVulkanMemoryManager.cpp

Source/Rendering/VulkanRenderer/imstkVulkanRenderer.cpp

Source/Rendering/VulkanRenderer/imstkVulkanVertexBuffer.cpp

Source/Rendering/VulkanRenderer/imstkVulkanVertexBuffer.h