1575 image tiling

[k034b363]

Describe your changes
This function takes as input a list of images and a desired number of rows and columns and outputs a composite image. Tiling is expected to be useful for visualizing the results of several kmeans model fits with changing parameters.

Type of update

• New feature or feature enhancement

Associated issues
This PR closes issue #1575

Additional context

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

[deepsource-io]

Here's the code health analysis summary for commits 248f983..cf74ff1. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		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]

Looks great! The orientation of the seeds pointing at each other in the tile output in the doc image is so satisfying haha. I just tweaked the unit test a little to use preexisting test data.