feat(channel): 新增微信小店赠品与买赠活动模块接口支持#4030

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copilot/fix-1343140-49122742-f5592df9-6312-4996-9035-a3f2c97651a8binarywang/WxJava:copilot/fix-1343140-49122742-f5592df9-6312-4996-9035-a3f2c97651a8Copy head branch name to clipboard