[FEATURE] Support byte sized vector in Lucene engine

[vamshin]

Is your feature request related to a problem?
Currently vectors are represented as floats(4 Bytes) for each dimension. This could lead to large storage and memory requirements to construct/load/save/search graphs and at scale becomes costly and also hard to manage the cluster requirements. In some cases, customers prefer to reduce the storage/memory foot prints at the cost of loosing tolerable recall.

What solution would you like?
We could provide Byte sized vectors that can use one Byte per dimension instead of current 4 Bytes using the ByteVector feature of Lucene. By providing quantization techniques we could let the floats convert to Int[-128 to 127] at loss of some precision and hence provide reduction to storage and memory requirements

[navneet1v]

If you are interested in this feature, please do a +1. If possible please leave a comment about your usecase.