.Net: New Feature: Add Azure AI Search in yaml serialization schema

[jfomhover]

---

name: Feature request
about: Add another tool type in agent schema

In the schema https://github.com/microsoft/ai-foundry-for-vscode/blob/main/schema/agent/1.0.0/schema.json
there's only support for bing, file search, openapi and code interpreter but no Azure AI Search, with a connection and index name. Could we add this support?