HNSW SQL Support Part 1

[hatyo]

This adds SQL support for creating a table organized by HNSW, the following syntax is introduced

create table photos(zone string, recordId string, embedding vector(768), 
primary key (zone, recordId), 
organized by hnsw(embedding partition by zone) with (hnsw_m = 10, hnsw_ef_construction = 5))

It also adds support to vector data type, with various supported precisions and arbitrary size, the following versions are supported:

VECTOR(size)
VECTOR16(size)
VECTOR32(size)
VECTOR64(size)
FLOATVECTOR(size)
DOUBLEVECTOR(size)
HALFVECTOR(size)

under the hood, the vector is stored as a normal bytes array. The precision and size information are mere metadata artifacts.