agxv: implement DrawIndirect(Indexed)
DrawIndirect and DrawIndirectIndexed both do not run in the CTS, as the image lowering needs to be done still (I plan to do this). I was able to test DrawIndirect in a modified wgpu hello-triangle example to use indirect. DrawIndirectIndexed appears to work but some other agxv bug makes it look weird
Signed-off-by: i509VCB git@i509.me
Edited by i509VCB