Add image data classes

[nfahlgren]

Describe your changes
Adds a data subpackage with classes for a generic Image, color images (RGB and BGR), grayscale (GRAY), and hyperspectral (HSI). Adds tests for initializing the classes. Image is a subclass of numpy.ndarray and the other classes are subclasses of Image. For the standard data types this mostly just adds a uri (unique resource identifier such as a file path, URL, etc.) attribute to the arrays. HSI replicates what we have done with Spectral_data but in a NumPy compatible framework.

Type of update
Is this a: New feature or feature enhancement

For the reviewer
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• 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 bce4d07..47e8143. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	❌ Failure	❗ 1 occurence introduced	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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