[gs] Added ethernet port

cmake/dependencies.cmake

src/boards/Groundstation/Base/Hub.cpp

src/boards/Groundstation/Base/Ports/Ethernet.cpp

src/boards/Groundstation/Base/Ports/Ethernet.h

src/boards/Groundstation/Common/Config/EthernetConfig.h

src/boards/Groundstation/Common/Ports/EthernetBase.cpp

src/boards/Groundstation/Common/Ports/Serial.cpp

src/boards/Groundstation/Common/Ports/Serial.h

src/entrypoints/Groundstation/base-groundstation-entry.cpp