verkle: Add tests for verkle bytes helper

[scorbajio]

This change helps increase test coverage of the verkle package bytes helper by adding some unit tests.

[holgerd77]

I wonder if this method is rather something for our Util package or is even already present there in some form? 🤔

[acolytec3]

I checked in the bytes part of util and don't see anything exactly like it. Given that this is a pretty niche use case (specifically for parsing verkle stems), I'm not sure if it makes sense to move it or not. I'm not sure if I can conceive of a use for it outside of verkle (at least not in Ethereum land where our util library might be imported) so would probably be happy to keep it in verkle.

[scorbajio]

I was also able to optimize it a bit:

Current Approach x 630 ops/sec ±1.08% (93 runs sampled)
Optimized Approach x 1,059 ops/sec ±4.31% (93 runs sampled)
Fastest is Optimized Approach

Benchmark file: bench.ts.tar.gz

[holgerd77]

@acolytec3 sure, then let's keep! 👍

[acolytec3]

Did you do performance testing to show that this is faster? It's not obvious to me why this is any faster than iterating element by element.

[scorbajio]

Yes the benchmark file is in the above comment: #3441 (comment). Since multiple bytes are being compared at a time, the loop runs less times and handles the remaining comparisons outside of the first loop.

[acolytec3]

Ah, sorry, didn't see this. Thanks for the comparison!

[acolytec3]

LGTM!