.Net: Added example of Plan generation and execution using Auto Function Calling

[dmytrostruk]

Motivation and Context

Resolves: https://github.com/microsoft/semantic-kernel/issues/6745

This PR contains example which shows how to implement plan generation and execution with Auto Function Calling and enable telemetry, filters and caching. ChatHistory object is used for plan manipulation and execution.

Contribution Checklist

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