dos: Apply circuit creation defenses if circ max queue cell reached

David Gouletrequested to merge
dgoulet/tor:ticket40680_047_01 into maint-0.4.7

This adds two consensus parameters to control the outbound max circuit queue cell size limit and how many times it is allowed to reach that limit for a single client IP.

Closes #40680 (closed)

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

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