Remove utils module

[joshqsumner]

Describe your changes
Deleted plantcv.utils moving tabulate_bayes_classes to plantcv.learn and json2csv/sample_images to plantcv.parallel.

Type of update
This is a... code cleanup?

Associated issues
Closes #1833

Additional context
Removes cli interface for json2csv, preserves other 2 cli options. Long term I think this is just an intermediate step to having json2csv in plantcv.plantcv so that we can have process_results functions for non-parallel workflows that generate several json files. Maybe at that point we will add another cli utility to combine all the matching json files in a directory again.

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]

DeepSource Code Review

DeepSource reviewed changes in the commit range 08221a3..538c49a on this pull request. Below is the summary for the review, and you can see the individual issues we found as review comments.

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PR Report Card

Security	× 0 issues		Overall PR Quality
Reliability	× 0 issues
Complexity	× 0 issues
Hygiene	× 0 issues
Coverage	× 0 issues

Code Review Summary

Analyzer	Status	Summary	Details
Python		No new issues detected.	Review ↗
Test coverage		No new issues detected.	Review ↗

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Code Coverage Summary

Language	Line Coverage		Branch Coverage
	New Code	Overall	New Code	Overall
Aggregate	100% [✓ above threshold]	100%	100%	100%
Python	100% [✓ above threshold]	100%	100%	100%

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