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Enforce recommended and required protocol versions in arti-client

Nick Mathewson requested to merge nickm/arti:proto_enforce into main

See the specification for a description of the behavior here.

Briefly, this MR makes it so that arti-client knows which protocol versions it supports, and will watch for any recommended or required protocols that it does not support. On a missing recommended protocol, it will warn. On a missing required protocol, it will give an error and exit. The exit behavior can be overridden.

Closes #1849 (closed).

Closes #1923 (closed).

Does not address these follow-up issues: #1932, torspec#319 (closed).

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