.Net: MistralAI Connector

[markwallace-microsoft]

Motivation and Context

AI connector for MistralAI

Description

• [x] Connector and unit test projects initial check-in
• [x] Chat completion support
• [x] Embedding support
• [x] Streaming chat completion support
• [x] Function calling support
• [x] Streaming function calling support
• [x] Support for function calling filters

Multiple tool calls is not supported

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 :smile: