Expose HyperLogLogPlusPlus#add(byte[], int offset, int size)

Some callers can have binary representations that look like: `byte[], int offset, int size`.

The only current access pattern for bytes is `HyperLogLogPlusPlus#add(byte[] bytes)`, which forces such callers to copy bytes. This copy can be avoided because `HashFunction` exposes `HashFunction#hashBytes(byte[] input, int off, int len)`.