.Net: Voyageai integration

[fzowl]

Motivation and Context

Voyageai integration

Description

Added VoyageAI text, contextual and multimodal embeddings and reranker, similarly to other implementations.

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 😄

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[fzowl]

@microsoft-github-policy-service agree [company="VoyageAI"]