[gs] Initial complete implementation of gs software

CMakeLists.txt

cmake/dependencies.cmake

src/boards/Gs/Config/RadioConfig.h

src/boards/Gs/Config/SerialConfig.h

src/boards/Gs/Ports/Serial.cpp

src/boards/Gs/Ports/Serial.h

src/boards/Gs/Radio/Radio.cpp

src/boards/Gs/Radio/Radio.h

src/boards/Gs/Radio/RadioStatus.cpp

src/boards/Gs/Radio/RadioStatus.h

src/boards/common/Radio.h

src/entrypoints/Gs/gs-entry.cpp