New GoCollector metrics in 1.12 do not pass promtool check metrics lint

[chancez]

Using git tag v1.12.1, if we run promtool check metrics on our metrics we get the following failure:

go_gc_heap_allocs_by_size_bytes_total non-counter metrics should not have "_total" suffix
go_gc_heap_frees_by_size_bytes_total non-counter metrics should not have "_total" suffix
go_gc_pauses_seconds_total non-counter metrics should not have "_total" suffix

It seems that new metrics were potentially introduced in #955

I also filed prometheus/prometheus#10574 before realizing these are new metrics as part of a library upgrade, though it still seems useful in general.

[bwplotka]

Hmm, those are indeed histogram metrics, which are derived from runtime/metrics - thanks for pointing.

I would really consider renaming it now, given it's a fresh change (but this will break some compatibility though). Let me look on it.