6020 avoid creating cufile.log when import monai

[wyli]

Fixes #6020

Description

pip install cucim
python -c "import cucim"

may create a cufile.log file in the current working directory (please see rapidsai/cucim#514)

this PR delays the cucim imports to when the modules are really needed.

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.

[Nic-Ma]

Looks good to me.
@drbeh Do you have any other comments?

Thanks in advance.

[mingxin-zheng]

This also looks good to me. cucim is not used in Auto3DSeg unless users change the default.

[wyli]

/build