fix:The generated Postman collection does not support file uploads

[delei]

Summary(关于这个pr的描述)

fix: The generated Postman collection does not support file uploads #622

Basic example(pr的用例)

controller用例

/**
 * 上传单个文件V1
 * @param userId 用户id
 * @param file 文件
 * @return
 */
@PostMapping(value = "/upload",consumes = "multipart/form-data")
public Result upload(String userId,@RequestParam MultipartFile file) {
    return Result.success();
}

/**
 * 上传单个文件V2
 * @param userId
 * @param userData
 * @param file
 * @return
 */
@PostMapping("upload2")
public Result formData2(String userId,@RequestParam String userData, MultipartFile file){
    return Result.success();
}

/**
 * 批量上传文件
 * @param file 文件
 * @return
 */
@PostMapping(name = "/batchUpload1",consumes = "multipart/form-data")
public Result batchFileUpload1(MultipartFile[] file) {
    return Result.success();
}

/**
 * 批量上传文件1
 * @param file 文件
 * @return
 */
@PostMapping(value = "/batchUpload2",consumes = "multipart/form-data")
public Result batchFileUpload2(List<MultipartFile> file) {
    return Result.success();
}

Postman效果截图

Postman version: 10.18.11

使用PostmanJsonBuilder生成postman.json文件，然后导入到Postman工具中，请求参数 file 显示为 File类型，效果如下:

Motivation(提出这个pr目的)

fix: issue #622