[Feature][hdfsFile Source] hdfsFile source didn`t support pure json line, without schema.

[chang-wd]

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Description

hdfsFile source didn`t support pure json line now, without schema.
目前的hdfsFile source 不支持单纯的 json 行文本（不需要写明 schema），期望支持，这样对于复杂的嵌套格式兼容性更好。
数据传输组件只负责数据推送本身，将复杂结构的组装和解析还给数据生成方和消费方。

Usage Scenario

json line，对于复杂的嵌套格式兼容性更好。
数据传输组件只负责数据推送本身，将复杂结构的组装和解析还给数据生成方和消费方。

Related issues

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[litiliu]

is it possible to use the binary file_format, and set the filename_extension to json?