DenseVectorField - Introduce support for 1 Byte precision vectors

Lucene 9.4.0 has introduced the possibility of encoding vectors with 1-byte precision.

DenseVectorField should be extended in order to use a such encoding.

A new vector encoding parameter should be added to DenseVectorField:

• FLOAT32 (default)
• BYTE

The new encoding should also be applied to the DenseVectorField stored fields.