Tracking issue for FlowSOM interoperability

[berombau]

Clustering with FlowSOM is possible and cell clustering with napari-cluster-plotter (https://github.com/saeyslab/harpy/blob/main/experiments/example_of_cluster_plotter.ipynb) is possible. It would be interesting to view the FlowSOM tree in a similar widget and allow labeling of the metaclusters on the tree (similar to Pixie pipeline notebook GUI, but with the imaging data in napari instead of Mantis).

• create Widget class
• button to cluster
• button to plot FlowSOM tree
• button to get labels in table
• select with lasso tool
• view selection on images
• allow renaming metacluster labels to cell type names
• plot cluster heatmap similar to to Pixie pipeline