Merge bitcoin/bitcoin#28584: Fuzz: extend CConnman tests

0802398e74 fuzz: make it possible to mock (fuzz) CThreadInterrupt (Vasil Dimov)
6d9e5d130d fuzz: add CConnman::SocketHandler() to the tests (Vasil Dimov)
3265df63a4 fuzz: add CConnman::InitBinds() to the tests (Vasil Dimov)
91cbf4dbd8 fuzz: add CConnman::CreateNodeFromAcceptedSocket() to the tests (Vasil Dimov)
50da7432ec fuzz: add CConnman::OpenNetworkConnection() to the tests (Vasil Dimov)
e6a917c8f8 fuzz: add Fuzzed NetEventsInterface and use it in connman tests (Vasil Dimov)
e883b37768 fuzz: set the output argument of FuzzedSock::Accept() (Vasil Dimov)

Pull request description:

  Extend `CConnman` fuzz tests to also exercise the methods `OpenNetworkConnection()`, `CreateNodeFromAcceptedSocket()`, `InitBinds()` and `SocketHandler()`.

  Previously fuzzing those methods would have resulted in real socket functions being called in the operating system which is undesirable during fuzzing. Now that https://github.com/bitcoin/bitcoin/pull/21878 is complete all those are mocked to a fuzzed socket and a fuzzed DNS resolver (see how `CreateSock` and `g_dns_lookup` are replaced in the first commit).

ACKs for top commit:
  achow101:
    ACK 0802398e74
  jonatack:
    Review re-ACK 0802398e74
  dergoegge:
    Code review ACK 0802398e74

Tree-SHA512: a717d4e79f42bacf2b029c821fdc265e10e4e5c41af77cd4cb452cc5720ec83c62789d5b3dfafd39a22cc8c0500b18169aa7864d497dded729a32ab863dd6c4d

src/test/util/net.h

@@ -71,6 +71,24 @@ struct ConnmanTestMsg : public CConnman {
         m_nodes.clear();
     }
 
+    void CreateNodeFromAcceptedSocketPublic(std::unique_ptr<Sock> sock,
+                                            NetPermissionFlags permissions,
+                                            const CAddress& addr_bind,
+                                            const CAddress& addr_peer)
+    {
+        CreateNodeFromAcceptedSocket(std::move(sock), permissions, addr_bind, addr_peer);
+    }
+
+    bool InitBindsPublic(const CConnman::Options& options)
+    {
+        return InitBinds(options);
+    }
+
+    void SocketHandlerPublic()
+    {
+        SocketHandler();
+    }
+
     void Handshake(CNode& node,
                    bool successfully_connected,
                    ServiceFlags remote_services,