Added Hashing Functions Xxhash64 and Xxhash32

Why it matters

These hashing functions offer fast and efficient hash calculations, improving performance for use cases such as data partitioning, indexing, and checksumming. They provide users with more options for generating hash values, which can be useful in distributed processing and deduplication scenarios.

How to use it

Users can apply the functions by calling xxHash64(column_or_expression) or xxHash32(column_or_expression) within their SELECT queries or other expressions where a hash value is required.