Fix nson benchmarks

[kehiy]

Based on https://100go.co/89-benchmarks/ guide, we have to take some action to get an accurate benchmark. I updated these benchmarks to have a better result.

[kehiy]

Also, it would be good if someone runs the benchmarks on the same device again to have a comparison. (I don't know how much these two hardware differ, to be honest)

[fiatjaf]

Thank you. I'll accept this for historical reasons, but I'm thinking about removing nson and the binary encoding from this repo, since they're not really a Nostr standard (and shouldn't be), and move the binary stuff to eventstore which is the only other library using them.

[kehiy]

@fiatjaf Cool, that's a good idea and I agree with it. we can add changes to your benchmark repo as well.