Add Ping method and refactor import paths in client.go

The client.go file has been modified to include a new Ping method. This addition allows the server's status to be checked. Also, the import paths of the grpc library and other dependencies have been updated to reflect changes in their locations.

v2/client.go

@@ -4,9 +4,9 @@ import (
 	"context"
 	"fmt"
 	"github.com/kubemq-io/kubemq-go/v2/config"
+	"github.com/kubemq-io/kubemq-go/v2/grpc"
 	"github.com/kubemq-io/kubemq-go/v2/pubsub/events"
 	"github.com/kubemq-io/kubemq-go/v2/pubsub/events_store"
-	"github.com/kubemq-io/kubemq-go/v2/pubsub/grpc"
 	"time"
 )
 
@@ -117,6 +117,13 @@ func (c *Client) SubscribeToEventsStore(ctx context.Context, subscription *event
 	return nil
 }
 
+func (c *Client) Ping(ctx context.Context) (*grpc.ServerInfo, error) {
+	if c.clientCtx.Err() != nil {
+		return nil, fmt.Errorf("client is closed")
+	}
+	return c.transport.Ping(ctx)
+}
+
 func (c *Client) Close() error {
 	c.clientCancelFunc()
 	return c.transport.Close()