Merge #20788: net: add RAII socket and use it instead of bare SOCKET

615ba0eb96cf131364c1ceca9d3dedf006fa1e1c test: add Sock unit tests (Vasil Dimov)
7bd21ce1efc363b3e8ea1d51dd1410ccd66820cb style: rename hSocket to sock (Vasil Dimov)
04ae8469049e1f14585aabfb618ae522150240a7 net: use Sock in InterruptibleRecv() and Socks5() (Vasil Dimov)
ba9d73268f9585d4b9254adcf54708f88222798b net: add RAII socket and use it instead of bare SOCKET (Vasil Dimov)
dec9b5e850c6aad989e814aea5b630b36f55d580 net: move CloseSocket() from netbase to util/sock (Vasil Dimov)
aa17a44551c03b00a47854438afe9f2f89b6ea74 net: move MillisToTimeval() from netbase to util/time (Vasil Dimov)

Pull request description:

  Introduce a class to manage the lifetime of a socket - when the object
  that contains the socket goes out of scope, the underlying socket will
  be closed.

  In addition, the new `Sock` class has a `Send()`, `Recv()` and `Wait()`
  methods that can be overridden by unit tests to mock the socket
  operations.

  The `Wait()` method also hides the
  `#ifdef USE_POLL poll() #else select() #endif` technique from higher
  level code.

ACKs for top commit:
  laanwj:
    Re-ACK 615ba0eb96cf131364c1ceca9d3dedf006fa1e1c
  jonatack:
    re-ACK 615ba0eb96cf131364c1ceca9d3dedf006fa1e1c

Tree-SHA512: 3003e6bc0259295ca0265ccdeb1522ee25b4abe66d32e6ceaa51b55e0a999df7ddee765f86ce558a788c1953ee2009bfa149b09d494593f7d799c0d7d930bee8

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