Add metrics for monitoring to TAD

[ChristopherSpelt]

To monitor the application you need the application to expose metrics like

• requests_total
• responses_total
• requests_processing_time_seconds
• exceptions_total

usefull dimensions for these metrics might be method, path and status_code

• We assume we have Prometheus (so we choose for a pull based system).
• Add a middleware layer.
• Open Telemetry and Prometheus middleware are available. Not sure if Open Telemetry works with Prometheus. Research question on which one we will choose.

[github-actions[bot]]

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