refactor cluster connection in CLI

internal/cli/client/client.go

@@ -8,11 +8,13 @@ import (
 	"uncloud/internal/machine/api/pb"
 )
 
+// Client is a client for the machine API.
 type Client struct {
 	connector Connector
 	conn      *grpc.ClientConn
 
 	pb.MachineClient
+	pb.ClusterClient
 }
 
 // Connector is an interface for establishing a connection to the machine API.
@@ -21,6 +23,8 @@ type Connector interface {
 	Close() error
 }
 
+// New creates a new client for the machine API. The connector is used to establish the connection
+// either locally or remotely. The client is responsible for closing the connector.
 func New(ctx context.Context, connector Connector) (*Client, error) {
 	c := &Client{
 		connector: connector,
@@ -32,6 +36,7 @@ func New(ctx context.Context, connector Connector) (*Client, error) {
 	}
 
 	c.MachineClient = pb.NewMachineClient(c.conn)
+	c.ClusterClient = pb.NewClusterClient(c.conn)
 	return c, nil
 }