Bor binary version in metrics

[crisand2]

Rationale

Insert the bor version in the prometheus metrics. This is useful in larger stacks for monitoring versions on the actual nodes.

For example erigon provides this metric in the form

# HELP erigon_info
# TYPE erigon_info gauge
erigon_info{commit="9da58c0bd335c9e9474361c8520d6ac5ee4d80ab",version="3.00.0"} 1

[marcello33]

Thanks @crisand2
Will consider this