Create scaffolding of ddl-simulator

Implement global server as control plane

Implement device to get their info from global server and connect each
others

go.mod

@@ -0,0 +1,18 @@
+module git.pengzhan.dev/ddp-simulator
+
+go 1.22.2
+
+require (
+	github.com/cenkalti/backoff/v4 v4.3.0
+	github.com/sirupsen/logrus v1.9.3
+	google.golang.org/grpc v1.67.0
+	google.golang.org/protobuf v1.34.2
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	golang.org/x/net v0.28.0 // indirect
+	golang.org/x/sys v0.24.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 // indirect
+)