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tor-spec: Disallow single hop streams

Clara Engler requested to merge cve/torspec:dev/cve/protocol-violation into main

Current ctor will send a DESTROY cell with a protocol violation as its reason, when you use a valid exit node as a guard to create a single hop circuit and send a RELAY_BEGIN cell through it.

This commit outlines this behavior, by suggesting implementations to treat such a behavior as a protocol violation.

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