nvk: Compile geometry shaders

nvk: Compile geometry shaders

This enables compiling geometry shaders.  Based primarily on gallium
nvc0/nvc0_program.c.

We need to enable/disable user clip planes based on the last geometry
stage.  Some asserts in codegen need to be changed too because the
compacted clip distance inputs are arrayed in the geometry shader. So we
have an array of clip distances for each input vertex.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24326>