Add back extra hashing functions (sha256hex/murmur)

[pi0]

Relavant topics: #133, #150

ohash v1 used to have support for murmurhash and sha256 (hex).

With v2 we removed them since main functionality is one single hash() behavior but seems community was using different ones commonly.

We could add them back as new subpaths ohash/murmur / ohash/sha256

[transitive-bullshit]

generally default to using hex encoding.

hash-object supports an optional encoding param. would love to see similar support here. (the downside of hash-object is it's async everywhere)