A point or box to polygon conversion tool

[dlangenk]

With SAM we can convert points or boxes to polygons quite reliably, so we could make this available as a tool to convert (manual) annotations. We could either add the SAM based point, box -> polygon conversion tool to Maia or implement this as a separate tool, which reuses most of the MAIA UI for quality control. The python scripts are already there to perform the conversion.