Tkakar/cat 673 add epics support

[tkakar]

Summary

This PR adds support to visualize EPIC segmentation masks in the unified views.

Design Documentation/Original Tickets

CAT-673

Testing

Manually tested for test datasets on Dev with visualizations

Screenshots/Video

Checklist

• [x] Code follows the project's coding standards
  • [ ] Lint checks pass locally
  • [ ] New CHANGELOG-your-feature-name-here.md is present in the root directory, describing the change(s) in full sentences.
• [ ] Unit tests covering the new feature have been added
• [x] All existing tests pass
• [ ] Any relevant documentation in JIRA/Confluence has been updated to reflect the new feature
• [ ] Any new functionalities have appropriate analytics functionalities added

Additional Notes

Please specify any additional information or context relevant to this PR.

[tkakar]

@john-conroy thanks for the suggestions. Will work on implementing them.