Prometheus metric

[TheFelin]

Is this a new feature request?

• I have searched the existing issues

Wanted change

-DENABLE_PROMETHEUS=1

Reason for change

Juste for add in Prometheus and grafana statistics

Proposed code change

https://wiki.minetest.net/Server_Metrics_using_Prometheus

[github-actions]

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[LinuxServer-CI]

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