feat: add end-to-end benchmark for Metal MSM pipeline

[yaroslavyaroslav]

This is the implementation of benchmarking of shaders of msm 0.2.0 version.

There's two benchmarks available:

• cargo bench -p mopro-msm --bench shaders -- --sample-size 100 --warm-up-time 3 --measurement-time 10
• cargo bench -p mopro-msm --bench e2e -- --sample-size 100 --warm-up-time 3 --measurement-time 10

The latter one just calls related unit test under the hood, which is honestly makes little sense since the amount of CPU work's going on under the hood, so it gives little chance of measuring really interesting part -- shaders running time.

The former is the opposite, it mimics the each shader from 0.2.0 unit test running each of them on a set of input sizes, and it measures how long is it take shader to run since the dispatch to the finish in the pretty isolated way.

[moven0831]

lgtm, would you add the instructions for benchmarking using this approach to the README?

[yaroslavyaroslav]

Yeah, done.