Investigate GPU acceleration

[ledwards2225]

Main goal here is to get a clearer idea of what we should focus on re GPUs, e.g.:

• Does mojo solve the problem of needing to write per-platform GPU logic?
• Are there known techniques/libraries we can leverage to get easy wins?
• Where should we focus our efforts

Note: Worth seeing if there's anything useful in Ligero's WebGPU prover here

[ledwards2225]

Worth seeing if there's anything useful in Ligero's WebGPU prover here