Add MobileSam OpenVINO IR notebook

[mhpanah]

This PR adds a new MobileSAM segmentation tutorial demonstrating how to:

• Download a pinned MobileSAM vit_t checkpoint.
• Convert the image encoder and prompt decoder directly from PyTorch to OpenVINO IR.
• Validate OpenVINO outputs against the original PyTorch model.
• Run point and box-prompt image segmentation.
• Use an interactive click-to-segment demo.
• Measure model size and device-dependent inference latency.
• The notebook uses shared OpenVINO Notebook utilities, supports selectable OpenVINO devices, reuses the existing coco_bike.jpg sample, and includes reproducibility checks.

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