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Draft: panfrost: Implement blitter->draw_rectangle

Alyssa Rosenzweig requested to merge alyssa/mesa:panfrost/tiler-for-u_blitter into main 
u_blitter allows drivers to implement their own draw_rectangle path, using
hardware-specific features to accelerate simple 2D blits beyond what draw_vbo
can do. In particular, draw_rectangle provides access to the vertex attributes
and does not mandate the use of a vertex shader. This commit implements
draw_rectangle using the infrastructure in pan_blit, generating a tiler job
directly, avoiding the roundtrip through a vertex shader.

Draft because I hate this whole series so much. The goal was investigating what we'll want on the panvk side for !17438 (closed)

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