tor/changes/ticket40363

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o Major features (Proposal 332, onion services, guard selection algorithm):
- Clients and onion services now choose four long-lived "layer 2" guard
relays for use as the middle hop in all onion circuits. These relays are
kept in place for a randomized duration averaging 1 week each. This
mitigates guard discovery attacks against clients and short-lived onion
services such as OnionShare. Long-lived onion services that need high
security should still use the Vanguards addon
(https://github.com/mikeperry-tor/vanguards). Closes ticket 40363;
implements proposal 333.