fix: Navigate to contour should work

[wayfarer3130]

Context

The navigate to contour segmentation only worked for rehydrated contours or for any labelmap/volumes.

This PR adds code to navigate to the next contour. This requires that the viewport already display the right orientation viewport

Changes & Results

Added jumpToSegmentNext that differentiates between labelmaps and contours, using the existing logic for labelmaps.

Added a _getContourViewReferences that gets an array of view references indexed by slice index.

Added logic to get the closest view reference, or the next view reference if there isn't a closest.

Updated docs for SegmentationService

Testing

Load segmentation mode

Create a contour segmentation on a volume (should also test with a stack viewport that isn't a volume)

Draw several contours on several slices - you can vary the segment index if you want

Click on the segment index in the right hand panel to navigate to the "next" contour index for that segment.

Try the same thing with labelmaps - which will always navigate to center (might be a TODO to implement for labelmap to allow navigation to "next".

Checklist

PR

• [] My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• [] My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• [] OS:
• [] Node version:
• [] Browser:

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[cypress]

Viewers    Run #5865

Run Properties:   Passed #5865  •  0e19678cec: Switched back to jump to segment center for hte unit tests

Project	Viewers
Branch Review	fix/navigate-to-contour
Run status	Passed #5865
Run duration	02m 19s
Commit	0e19678cec: Switched back to jump to segment center for hte unit tests
Committer	Bill Wallace
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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	37
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