Thresholding

[yrkim98]

Please describe the problem that needs to be solved by this feature
When raw probability mappings are saved (cyto-dl outputs) we need to give the user a way to apply thresholds

How important is this feature to you? (Software team will re-prioritize all tickets based on current workload)
High Priority

Describe the solution you'd like
A widget in the plugin to test and apply multiple different thresholds

Additional context
Add any other context or screenshots about the feature request here.