feat(common): introduce common networking and CLI infrastructure

src/common/tcp_server_base.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "aliases.hpp"
+
+class TcpServerBase
+{
+  public:
+    TcpServerBase(IoContext &io, unsigned short port);
+    virtual ~TcpServerBase() = default;
+
+    void start();
+
+  protected:
+    virtual void createSession(TcpSocket socket) = 0;
+
+    TcpAcceptor acceptor_;
+};