Create GN/ninja build files for Kanto

To build and deploy Kanto within OpenHarmony it need to be build using GN/ninja.

• Create GN build file to use go toolchain on the host
• Make go toolchain available with either the prebuilts_download.sh script or in the docker image
• Build the Kanto static binary and place into target folder structure for image creation
• Verify executable does actually run on the target