Add support for Voyage embedding model

[kevintsai1202]

Voyage ( https://www.voyageai.com/ ) is a commercial model provider that specializes in embedding and re-rank models. When using Voyage's embedding + re-rank models, the hit rate in Chinese can reach up to 99% (https://ihower.tw/blog/archives/12227).

[ilayaperumalg]

Hi @kevintsai1202, Thanks for reporting and sorry about the delayed response. Would you be interested in contributing to add support for this via Spring AI Community here? You can submit a new feature request here. Closing the issue for now.