Support for IMGUI debug UI

[gunterhager]

Would it be possible to support adding debug UI with IMGUI like in the C version of chips? I found the debug UI in the C version of chips really helpful.
I tried to do a quick research into the topic but feel intimidated by the host gfx code.

[floooh]

Possible of course but a lot of work to port that code over to Zig (it's not possible to hook in the C code directly since the UI is closely entangled with the actual chip and system structs).