Update morphology tips outputs

[HaleySchuhl]

Describe your changes
The saved skeleton tips coordinates to Outputs was easily overwritten by other morphology functions that utilize the pcv.morphology.find_tips function. This branch contains changes to find_tips so that there is a helper function now that is used internally. Also adds pcv.morphology.segment_ends which saves both ends, the tip coordinates and the coordinates of the segment touching the branch point.

Type of update
Is this a:

• Bug fix
• New feature or feature enhancement
• Work in progress

Associated issues

• closes Skeleton tips easily overwritten within the plantcv.morphology sub-package #1643

Additional context
Using the internal segment end coordinates for leaf ID order

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

Debug Options

• use segment_img as required input and plot coordinates on top
  

• use mask as required input and plot segments + coordinates
  

[deepsource-io]

Here's the code health analysis summary for commits c6105a7..fa7f689. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	❌ Failure	❗ 1 occurence introduced 🎯 1 occurence resolved	View Check ↗
Test coverage	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Python
Branch Coverage	100%	100%
Composite Coverage	100%	100%
Line Coverage	100%	100%
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%, ✅ Above Threshold	100%, ✅ Above Threshold

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[HaleySchuhl]

Jan 3 updates: the deepsource complaint about the complexity of segment_insertion_angle will be resolved in another PR branch (called "update_segment_insertion_angle").

While thinking about how to get biologically-ordered observations out from a morphology workflow given this new function, there is a reason to return a re-ordered list of objects. These can then get used downstream to get consistently labeled leaf segment observations.