unioslo / mreg / 21474664809

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Add Prometheus metrics middleware and expose metrics endpoint (#605)

* Add Prometheus metrics middleware and expose metrics endpoint

- Implement PrometheusRequestMiddleware to track a selection of HTTP, DB, and LDAP metrics.
- Create MetricsView to serve metrics at /api/meta/metrics.
- Update URL routing to include metrics endpoint.
- Add tests for metrics endpoint and metrics recording.
- Include prometheus-client dependency in project configuration.

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