Feat/inference slicer segmentation

[LinasKo]

Description

Prerequisites:

• #1177

This allows the slicer to merge segmentation masks.

Previously it would fail when attempting to stack slices of different sizes, as there'd be no attempts to move & pad the slices. The result is that each mask would be of size(slice), rather than size(image).

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] This change requires a documentation update

How has this change been tested, please provide a testcase or example of how you tested the change?

Same notebook as for prior PR. :notebook: Google Colab

Any specific deployment considerations

1. Non-max suppression wrecks the visuals for large images. Best way to test would be to merge the PRs adding Non-max merging & slicer filter selector, and then test with NONE.
2. It takes a lot of RAM and time, even for a small model. High-RAM env in Colab is needed.

Docs

• [ ] Docs updated? What were the changes: