Example code styles are not included

[hkvision]

https://github.com/intel-analytics/BigDL/blob/main/python/dllib/dev/lint-python#L23 https://github.com/intel-analytics/BigDL/blob/main/python/chronos/dev/test/lint-python#L23 https://github.com/intel-analytics/BigDL/blob/main/python/orca/dev/test/lint-python#L23 Currently only the files under src are tested, plenty of style errors in examples...

[hkvision]

https://github.com/intel-analytics/BigDL/pull/4494 Friesian fixed here

[TheaperDeng]

sure, I will have a look

[hkvision]

https://github.com/intel-analytics/BigDL/pull/5692 Fixes Orca. Excludes tests and bert example. Bert has too many many style errors, mostly indent issues, ignored.