Initial Kernel Bench "compiler"

[rengolin]

New tool to import, compile and run Kernel Bench examples.

So far:

• Using the new transform to fix args.
• Overriding Kernel Bench input argument shapes.
• Default pipeline lowers to loops / scalar code

Next:

• Start working on an optimization pipeline for CPU
• Work on GPU execution
• Work on GPU optimization pipeline

Also:

• Move test descriptor files to a central location, and add search include path like python schedules