Add dependency graph to registry Change-Id: I6915a82af17bdb256a26fff5e6067c68ee19e3d8 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/qg/+/125198 Reviewed-by: Alexei Frolov <frolv@google.com> Commit-Queue: Erik Gilling <konkers@google.com>