.Net: Improved example with telemetry in filters for streaming scenario

[dmytrostruk]

Motivation and Context

Improved an example with telemetry in filters for streaming scenario to return streaming chunks from filter to operation's origin and logging the result at the same time.

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: