[FR] Please consider exposing the build_info of the exporter

[ChristianTackeGSI]

Most of the classic prometheus exporters expose something like node_exporter_build_info which includes version info and related stuff.

I think, it would be nice, if the eos-exporter would perform the same.

It should be quite straight forward:
We did it in our lustre-exporter lately:

• GSI-HPC/lustre_exporter@ef6b829

As we are using our own version handling (from a quick glance, you're also), we needed additional handling:

• GSI-HPC/lustre_exporter@e6d2405