Requesting Visualizer to accept camera with intrinsic image size bigger than the Window size itself.

**Is your feature request related to a problem? Please describe.**
I work with 8K images and am trying to run Colormap using a custom camera trajectory. Get frustrated with the warning "ConvertFromPinholeCameraParameters() failed because window height and width do not match."

**Describe the solution you'd like**
Expose API to create custom sized visualizer windows in python.

**Describe alternatives you've considered**
I tried running the code with 8K camera instrinsics in headless rendering mode but that did not make the error go away.

**Additional context**
None.