增加微信公众号数据统计功能 (#279)

* * fix: 移除代码中的Println

* 增加公众号数据统计

* fix code style

officialaccount/officialaccount.go

@@ -1,6 +1,7 @@
 package officialaccount
 
 import (
+	"github.com/silenceper/wechat/v2/officialaccount/datacube"
 	"net/http"
 
 	"github.com/silenceper/wechat/v2/credential"
@@ -101,3 +102,8 @@ func (officialAccount *OfficialAccount) GetDevice() *device.Device {
 func (officialAccount *OfficialAccount) GetBroadcast() *broadcast.Broadcast {
 	return broadcast.NewBroadcast(officialAccount.ctx)
 }
+
+//GetDataCube 数据统计
+func (officialAccount *OfficialAccount) GetDataCube() *datacube.DataCube {
+	return datacube.NewCube(officialAccount.ctx)
+}