feat(video): add like/unlike/isliked/getlikescount APIs for videos

internal/video/like_entity.go

@@ -0,0 +1,10 @@
+package video
+
+import "time"
+
+type Like struct {
+	ID        uint `gorm:"primaryKey"`
+	VideoID   uint `gorm:"index, not null"`
+	AccountID uint `gorm:"index, not null"`
+	CreatedAt time.Time
+}