Malik Olivier Boussejra ab908106d3 test_window_impl.rs: Add first part half of show_example_app_custom_rendering
show_example_app_custom_rendering is implemented exactly as it is in the
original Dear ImGui in C++. The result should be the same.

The only difference is that `DragFloat`, used to control the size of the
drawings, is not implement as of now.

This example demonstrates how the custom drawing API can be used.
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