[fetcher]封装fetch以完成业务请求

### 封装fetch
```typescript
const fetcher = (url: IUrl,data: any)=>{...}
//GET
...
//POST
...
//PUT
...
//DELETE
...
...
```

### 暴露不同的功能模块
```typescript
export async function userRegister(regForm:IRegForm){...}
...
...
...
```

### 使用方式
```typescript
import { userRegister } from '...'

await userRegister(regForm)
...
...
```