feat: build info in metrics

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• using a standard gauge instead of non-standard Info which breaks Grafana dashboards, see the reverted commit Revert "feat(metric): add forest version to prometheus (#4535)" #4594 and Add Forest version in Prometheus metrics #4533 (comment)

# HELP build_info semantic version of the forest binary
# TYPE build_info gauge
build_info{version="0.19.2+git.9e3f418121e"} 1

Reference issue to close (if applicable)

Closes #4533

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.