Late Chunking support for Jina Embeddings

[gururise]

• Add support for Jina Late Chunking
• Switch default Jina embedding from jina-embeddings-v2-base-en to jina-embeddings-v3, which is the newer recommended embedding. Also supports multilingual text.

jina-embeddings-v3 support Late Chunking:
Apply the late chunking technique to leverage the model's long-context capabilities for generating contextual chunk embeddings.