[skip changelog] Demonstrate gRPC interface's LibraryResolveDependencies method in client_example (#552)

Author: per1234

Diff for: client_example/go.mod

@@ -6,4 +6,4 @@ require (
 	github.com/arduino/arduino-cli v0.0.0-20200109150215-ffa84fdaab21
 	github.com/gosuri/uitable v0.0.0-20160404203958-36ee7e946282 // indirect
 	google.golang.org/grpc v1.23.0
-)
+)

Diff for: client_example/main.go

@@ -164,6 +164,10 @@ func main() {
 	log.Println("calling LibrarySearch(audio)")
 	callLibSearch(client, instance)
 
+	// List the dependencies of the ArduinoIoTCloud library
+	log.Println("calling LibraryResolveDependencies(ArduinoIoTCloud)")
+	callLibraryResolveDependencies(client, instance)
+
 	// List installed libraries
 	log.Println("calling LibraryList")
 	callLibList(client, instance)
@@ -734,6 +738,26 @@ func callLibSearch(client rpc.ArduinoCoreClient, instance *rpc.Instance) {
 	}
 }
 
+func callLibraryResolveDependencies(client rpc.ArduinoCoreClient, instance *rpc.Instance) {
+	libraryResolveDependenciesResp, err := client.LibraryResolveDependencies(context.Background(),
+		&rpc.LibraryResolveDependenciesReq{
+			Instance: instance,
+			Name:     "ArduinoIoTCloud",
+		})
+
+	if err != nil {
+		log.Fatalf("Error listing library dependencies: %s", err)
+	}
+
+	for _, resp := range libraryResolveDependenciesResp.GetDependencies() {
+		log.Printf("Dependency Name: %s", resp.GetName())
+		log.Printf("Version Required: %s", resp.GetVersionRequired())
+		if resp.GetVersionInstalled() != "" {
+			log.Printf("Version Installed: %s\n", resp.GetVersionInstalled())
+		}
+	}
+}
+
 func callLibList(client rpc.ArduinoCoreClient, instance *rpc.Instance) {
 	libLstResp, err := client.LibraryList(context.Background(),
 		&rpc.LibraryListReq{