* #854 implement first data health checker draft
* #854 added support for qlib's data format, implemented factor check, reformatted summary
* adaptation current dataset
* format with black
* add data health check to docs
* fix sphinx error
* fix pylint error
* update code
* format with black
* format with pylint
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Co-authored-by: Linlang <Lv.Linlang@hotmail.com>
