Merge #21387: p2p: Refactor sock to add I2P fuzz and unit tests

40316a37cb02cf8a9a8b2cbd4d7153ffa57e7ec5 test: add I2P test for a runaway SAM proxy (Vasil Dimov)
2d8ac779708322e1235e823edfc9c8f6e2dd65e4 fuzz: add tests for the I2P Session public interface (Vasil Dimov)
9947e44de0cbd79e99d883443a9ac441d8c69713 i2p: use pointers to Sock to accommodate mocking (Vasil Dimov)
82d360b5a88d9057b6c09b61cd69e426c7a2412d net: change ConnectSocketDirectly() to take a Sock argument (Vasil Dimov)
b5861100f85fef77b00f55dcdf01ffb4a2a112d8 net: add connect() and getsockopt() wrappers to Sock (Vasil Dimov)
5a887d49b2b39e59d7cce8e9d5b89c21ad694f8b fuzz: avoid FuzzedSock::Recv() repeated errors with EAGAIN (Vasil Dimov)
3088f83d016e7ebb6e6aa559e6326fa0ef0d6282 fuzz: extend FuzzedSock::Recv() to support MSG_PEEK (Vasil Dimov)
9b05c49ade729311a0f4388a109530ff8d0ed1f9 fuzz: implement unimplemented FuzzedSock methods (Vasil Dimov)

Pull request description:

  Change the networking code and the I2P code to be fully mockable and use `FuzzedSocket` to fuzz the I2P methods `Listen()`, `Accept()` and `Connect()`.

  Add a mocked `Sock` implementation that returns a predefined data on reads and use it for a regression unit test for the bug fixed in https://github.com/bitcoin/bitcoin/pull/21407.

ACKs for top commit:
  practicalswift:
    Tested ACK 40316a37cb02cf8a9a8b2cbd4d7153ffa57e7ec5
  MarcoFalke:
    Concept ACK 40316a37cb
  jonatack:
    re-ACK 40316a37cb02cf8a9a8b2cbd4d7153ffa57e7ec5 reviewed `git range-diff 01bb3afb 23c861d 40316a3` and the new unit test commit, debug built, ran unit tests, ran bitcoind with an I2P service and network operation with seven I2P peers (2 in, 5 out) is looking nominal
  laanwj:
    Code review ACK 40316a37cb02cf8a9a8b2cbd4d7153ffa57e7ec5

Tree-SHA512: 7fc4f129849e16e0c7e16662d9f4d35dfcc369bb31450ee369a2b97bdca95285533bee7787983e881e5a3d248f912afb42b4a2299d5860ace7129b0b19623cc8

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