net-mgmt/prometheus3: Add new port

Add Prometheus 3.3.0, released on 2025-04-15, to the Ports tree.

Prometheus is a systems and service monitoring system.

This port is heavily based on net-mgmt/prometheus2.

Release notes:
https://github.com/prometheus/prometheus/releases/tag/v3.3.0

Migration guide:
https://prometheus.io/docs/prometheus/latest/migration/