Parallel calculation of the hash of a raw vector

`hash_fst(x, seed = NULL, block_hash = TRUE)`

- x
raw vector that you want to hash

- seed
The seed value for the hashing algorithm. If NULL, a default seed will be used.

- block_hash
If TRUE, a multi-threaded implementation of the 64-bit xxHash algorithm will be used. Note that block_hash = TRUE or block_hash = FALSE will result in different hash values.

hash value