metrics: Add connection socket family to metrics

David Gouletrequested to merge
dgoulet/tor:ticket40710_047_01 into maint-0.4.7

Adds either ipv4 or ipv6 to the "tor_relay_connections_total" stats.

Closes #40710 (closed)

Signed-off-by: David Goulet dgoulet@torproject.org

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