Create a demo to showcase new telemetry feature

[darthez]

This issue is depends on #905. Once telemetry work is completed we would like to create a demo that illustrates the integration of a Membrane pipeline with a tool like Prometheus.

The expected outcomes of this work are:

• code example as described above
• short video clip so it can be posted with the release notes on social media. Here is an example of such a clip - https://x.com/swmansion/status/1869778820016001130