fuzz: Add fuzzing harness for Socks5(...)

Summary:
This is a backport of core#19203, core#21328, core#20812 (for PickValueInArray((const std::array<T, size> &array)) and core#21371

with changes from:

• https://github.com/bitcoin/bitcoin/pull/21328/commits/6423c8175fad3163c10ffdb49e0df48e4e4931f1 (Socks5 port -> uint16_t)

Test Plan: ninja bitcoin-fuzzers

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D17137