Dev ofrecord auto truncating (#5412)

* auto_zero_padding -> auto_truncating in cpp

* auto_truncating for python interface

* fix element count

* fix

* fix bug auto_truncating<->dim1_varying_length

* auto_truncating -> truncate

* rm not in if

* of format

Co-authored-by: oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>