Adding VoyageAI integration

[fzowl]

Motivation and Context

VoyageAI provides state-of-the-art embeddings models

Description

Adding VoyageAI integration
MicrosoftDocs/semantic-kernel-docs#327

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[karianna]

@fzowl - test / build failures if you can PTAL?

[karianna]

@fzowl - seeing errors such as:

Error: Medium: Exception thrown in class com.microsoft.semantickernel.services.reranking.RerankResult at new com.microsoft.semantickernel.services.reranking.RerankResult(int, String, double) will leave the constructor. The object under construction remains partially initialized and may be vulnerable to Finalizer attacks. [com.microsoft.semantickernel.services.reranking.RerankResult, com.microsoft.semantickernel.services.reranking.RerankResult] At RerankResult.java:[line 21]At RerankResult.java:[line 21] CT_CONSTRUCTOR_THROW