Feature request: FarmHash

**First, Thanks for this wonderful tool !**

**Is your feature request related to a problem? Please describe.**
FarmHash is an Open Source Hashing Algorythm by Google (used notably in Big Query) that output 64 Bits Integer.

**Describe the solution you'd like**
It could be interesting to have this Algorythm available in Cyberchef along with others like SHA-2, md5 etc...

Link of the Open Source Repository: https://github.com/google/farmhash