[TEST] Check and confirm App SDK is compatible with MetaTensor monai 0.9.1

[MMelQin]

It is claimed that the MetaTensor in monai v0.9.1 is largely backwards compatible, though it is a good idea to test and confirm App SDK and the examples work without issues.

[MMelQin]

Tested the following example apps, and as the results show, the examples built with MONAI Bundle Inference operator succeeded, but unfortunately the apps built with the MONAI Seg Inference operator failed to work with monai v0.9.1.

• Spleen Seg example tested to be working
• Mullti-Model AI example, in PR #315, tested to be working, albeit with a single warning
• LiverTumor and UNETR examples failed to work due to error in invertd in the post transform

Bug #320 created for tracking the task to update App SDK to be compatible with monai v0.9.1. This issue can be closed and the aforementioned bug will be used moving forward.