Add ITK to the list of optional dependencies (#5858)

Add ITK to the list of optional dependencies.

### Types of changes
- [x] 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.
- [x] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [x] 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.

Signed-off-by: Dženan Zukić <[email protected]>

monai/config/deviceconfig.py

@@ -67,6 +67,7 @@ def get_optional_config_values():
     output = OrderedDict()
 
     output["Pytorch Ignite"] = get_package_version("ignite")
+    output["ITK"] = get_package_version("itk")
     output["Nibabel"] = get_package_version("nibabel")
     output["scikit-image"] = get_package_version("skimage")
     output["Pillow"] = get_package_version("PIL")