Colab demo : Inference

[C-Achard]

Adds a small demo notebook with :

• Inference on a small volume
• Plot of prediction and instance labels (2D with widget slider)
• Stats computation
• 3D plot of cells in volume + statistics

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TODO before merging :

• Change branch in pip install to main

[MMathisLab]

can you first incorporate the changes I made in #79 -- see intro differences, and added a launch button "in colab"

[C-Achard]

can you first incorporate the changes I made in #79 -- see intro differences, and added a launch button "in colab"

Done, thank you !