metrics: Add new relay metrics to MetricsPort

David Gouletrequested to merge
dgoulet/tor:ticket40816_049_01 into main

This commit adds the total number of DROP cell seen, the total number of DESTROY cell received and the total number of protocol violation that lead to a circuit close.

Closes #40816 (closed)

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

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