Add WIZnet W5500 UDP over IP socket echo interactive test helper

[apcountryman]

Add WIZnet W5500 UDP over IP socket (::picolibrary::WIZnet::W5500::IP::UDP::Socket) echo interactive test helper (::picolibrary::Testing::Interactive::WIZnet::W5500::IP::UDP::echo()).

• [x] The echo() function should be defined in the include/picolibrary/testing/interactive/wiznet/w5500/ip/udp.h/source/picolibrary/testing/interactive/wiznet/w5500/ip/udp.cc header/source file pair
• [x] The echo() function should have the following template parameters:
  • [x] typename Controller: The type of controller used to communicate with the W5500
  • [x] typename Device_Selector: The type of device selector used to select and deselect the W5500
• [x] The echo() function should have the following signature:

  template<typename Controller, typename Device_Selector>
  [[noreturn]] void echo(
  Reliable_Output_Stream &                         stream,
  Controller                                       controller,
  typename Controller::Configuration               configuration,
  Device_Selector                                  device_selector,
  ::picolibrary::WIZnet::W5500::PHY_Mode           phy_mode,
  ::picolibrary::WIZnet::W5500::Ping_Blocking      ping_blocking_configuration,
  ::picolibrary::WIZnet::W5500::ARP_Forcing        arp_forcing_configuration,
  std::uint16_t                                    retransmission_retry_time,
  std::uint8_t                                     retransmission_retry_count,
  MAC_Address                                      mac_address,
  IPv4::Address                                    ipv4_address,
  IPv4::Address                                    ipv4_gateway_address,
  IPv4::Address                                    ipv4_subnet_mask,
  ::picolibrary::WIZnet::W5500::Socket_Buffer_Size socket_buffer_size,
  ::picolibrary::WIZnet::W5500::Broadcast_Blocking broadcast_blocking_configuration,
  ::picolibrary::WIZnet::W5500::Unicast_Blocking   unicast_blocking_configuration,
  std::uint8_t                                     time_to_live,
  ::picolibrary::IP::TCP::Endpoint                 local_endpoint ) noexcept;

• [x] Documentation