Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/halo-sigs/plugin-migrate/blob/main/OWNERS)~~ [JohnNiang,ruibaby]
Approvers can indicate their approval by writing `/approve` in a comment
Approvers can cancel approval by writing `/approve cancel` in a comment
What this PR does?
新增数据导入 API 读取数据并返回 json
see https://github.com/halo-sigs/plugin-migrate/issues/4 for more details.