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vtn: introduce vtn_bindgen tool

Alyssa Rosenzweig requested to merge alyssa/mesa:vtn/bindgen-tool into main

What does this MR do and why?

vtn: introduce vtn_bindgen tool

This is a small command line utility to generate NIR bindings for a SPIR-V
library, using vtn's infrastructure for this. This is split out from asahi_clc
in an effort to make clc more modular. Notably, this tool does not depend on:

* LLVM, SPIRV-LLVM, CLC, etc (important for Android, and gets us closer to the
  clang spir-v future)
* Driver details other than addressing modes (which are already largely
  hardcoded, setting them to anything else doesn't make a ton of sense for CL C)
* The driver itself, or its backend compiler. That means that the backend
  compiler can depend on the generated bindings header, even if the compiler is
  also used for internal shader precompiling. This breaks the dep loop.

So in short term, this solves the dependency problem for asahi, and in the long
term helps more drivers use clc infrastructure without re-rolling things
themselves.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

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