[gui] Allowing recreating GGUI windows after ti.reset(). #3389
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I have been trying to write tests for GGUI, and one problem I encountered was that I couldn't run GGUI multiple times separated by ti.reset() calls. There were two reasons for this:
ti.reset() doesn't release the resources for the GGUI window. This PR adds an explicit destory() method that works around this. (i.e. after each test, I will call destroy() manually)
The vulkan_cuda interop function did not consider the fact that the VulkanDevice and CudaDevice could change. This is fixed in this PR.