Merkeltree upstream

[angaz]

Hi.

I upstreamed your changes to go-merkletree. I tried my best to verify that everything still worked the same, but I don't have an archive node, and the new multicaller setup takes too long to use Alchemy because the API timeout is 5 seconds, and at least getting the node addresses takes longer than that. A bit unfortunate.

I thought maybe you are still doing this kind of testing, so it would be easy for you to verify a previous interval. If you want me to test it, I guess I can ask to use someones archive node on the Discord.

I see no reason that it wouldn't work because there's really good test coverage in go-merkletree, but still, anything is possible and I don't want to break everything.