null pattern check on safeURLname
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Support SOCKS5 protocol for replication

Using "socks5" as the protocol in the "proxy" parameter of replication
requests will cause DNS resolution and data transfer to happen via a
SOCKS5 proxy server.

COUCHDB-2025
Mention SOCKS5 protocol option in docs

COUCHDB-2025
Merge branch '2025-feature-socks5'