Revert #6686

[KumoLiu]

Fixes #6685.

• Revert Fix the use of allow_smaller in CropForeground #6686 without changing the meaning of allow_smaller in generate_spatial_bounding_box.
• Update the docstring of the allow_smaller to make it more clear.
• Add deprecated_arg_default, then after 1.3, CropForeground with pad by default even if the image edges are smaller than the final box edges.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[wyli]

thanks, please also

• update

  MONAI/monai/metrics/utils.py

  Lines 178 to 180 in a5dff5b

  	cropper = CropForegroundD(
  	["pred", "gt"], source_key="src", margin=1, allow_smaller=True, start_coord_key=None, end_coord_key=None
  	)

• review the docstring and add descriptions for the behaviour allow_smaller=False

  MONAI/monai/transforms/utils.py

  Lines 974 to 975 in 2008c0e

  	allow_smaller: when computing box size with `margin`, whether to allow the image edges to be smaller than the
  	final box edges. If `True`, the bounding boxes edges are aligned with the input image edges, default to `True`.

[wyli]

Thanks for the quick updates

[wyli]

/build