Use Buffer.compare()

[twoeths]

Problem description

Buffer.compare() is faster than byteArrayEquals() so we should use it

Solution description

• With 32 bytes array, it's >2x faster

root equals
    ✔ ssz.Root.equals                                                  2.911293e+7 ops/s    34.34900 ns/op        -     291059 runs   10.1 s
    ✔ byteArrayEquals                                                  2.753759e+7 ops/s    36.31400 ns/op        -     275399 runs   10.1 s
    ✔ Buffer.compare                                                   6.513809e+7 ops/s    15.35200 ns/op        -     648881 runs   10.1 s

• With 100_000_000 bytes array (the size of a mainnet state as of Sep 2023) it's ~22x faster

✔ byteArrayEquals 100_000_000                                         7.908042 ops/s    126.4535 ms/op        -         76 runs   10.2 s
✔ Buffer.compare 100_000_000                                          171.9610 ops/s    5.815271 ms/op        -         10 runs   64.0 s

Additional context

May want to find the same usage in other places like ssz