Faster PoT verification without allocation or std

[nazar-pc]

PoT verification is a big part of the block verification cost, especially when syncing otherwise mostly empty blocks.

Before:

verify                  time:   [220.72 ms 225.27 ms 229.55 ms]

After:

verify                  time:   [204.92 ms 205.10 ms 205.30 ms]

Tested on Zen 4 CPU.

This change avoids std for AES-NI CPU feature detection on x86-64 and avoids heap allocation during verification, allowing for better data locality and overall better cache utilization, while also doing physically less work.

I also changed crate authorship since it was almost completely rewritten by me since its introduction in #1601, only some of the tests are still mostly the same.

Code contributor checklist:

• I have read, understood and followed contributing guide

[teor2345]

Looks fairly straightforward, thanks!