When the GPU runs out of memory, it needs to be handled in a better way in the UI

[sarthakpati]

Describe the bug
On GPUs with smaller VRAM (<11GB), the GUI errors out and asks the user to use the CLI.

To Reproduce
Steps to reproduce the behavior:
0. Have a GPU with smaller (<11GB) VRAM

1. Download the sample data
2. Run inference for tumor segmentation
3. See error about "unable to process though GUI, please try command line"

Expected behavior
Check for the amount of memory (both RAM and VRAM) and let the user know if it is insufficient to run the training and/or inference

FeTS Version
0.0.1