[venus-auth] make UpsertMiner accessable for user / 开放 UpsertMiner 接口

[LinZexiao]

链服务模块 / Chain Service Components

• [ ] venus
• [x] venus-auth
• [ ] venus-gateway
• [ ] venus-messager
• [ ] venus-miner
• [ ] 文档 / docs

订单服务模块 / Deal Service Components

• [ ] venus-market
• [ ] 文档 / docs

算力服务模块 / Storage Power Service Components

• [ ] venus-sector-manager
• [ ] venus-worker
• [ ] 文档 / docs

描述 / Description

• 应加上 miner 个数的限制
• 加入 miner 之前,应检查 miner 是否已经存在

[hunjixin]

@diwufeiwen 评估一下