Add Forest version in Prometheus metrics

[LesnyRumcajs]

Issue summary

Forest version would be useful for tracking versions in Grafana dashboards. This can be done now with limited amount of curls and call to binaries, but it's a hassle.

Other information and links

[LesnyRumcajs]

Re-opened due to revert #4594

[LesnyRumcajs]

Note: using info metric type might not be feasible given some default setups do not really like it.

From the infra team:

It also doesn't work on my Prometheus/Grafana stack https://github.com/ChainSafe/forest/tree/main/monitoring (custom dashboard, the default one doesn't work at the moment). Also, see prometheus/client_rust#111