Function rdx::ska_sort::ska_byte_sort_on_partitions

pub fn ska_byte_sort_on_partitions<T, E>(
    arr: &mut [T], 
    extract_key: E, 
    maximum_byte: u8, 
    start_offset: usize, 
    partitions: &mut [PartitionInfo]
) -> (u16, u8) where
    E: Fn(&T) -> u8, 

Sort an array using ska sort with byte keys. Pass in partition arrays, which are assumed have count_or_offset zeroed. Returns the number of partitions there are and the highest touched partition.