Params verbosity

[joshqsumner]

Describe your changes
Changing params.verbose from True/False to 0:2 with 0 being least verbose and 2 being most verbose. Also adds a verbosity_level argument to _debug so that it only does anything if params.verbose is high enough.

Type of update
This is a feature enhancement.

Associated issues
Closes #1826

Additional context
We have talked some about having more debug images printed if you're in an "extra verbose" mode, that is the goal here but I did not go through and try to add more debug images all over.

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 56ed841..7b55c84. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success	🎯 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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