Add Points.correct methods

[HaleySchuhl]

Describe your changes
Add .correct and .correct_label methods to Points class.

Type of update
Is this a:

• New feature or feature enhancement
• Work in progress

Goal implementation

• update .correct to add/remove objects to the binary mask without changing the shape of any objects (makes application more generalizable)
• don't update coordinates with correction, hand annotations are ground truth and correction maintains annotations that cannot be resolved algorithmically)
• .correct_labels can only allow class_label addition with different labels

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 c2ed906..687ee7c. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	❌ Failure	❗ 3 occurences introduced	View Check ↗

Code Coverage Report

Metric	Aggregate	Python
Branch Coverage	100%	100%
Composite Coverage	94.8% (down 5.2% from main)	94.8% (down 5.2% from main)
Line Coverage	94.8% (down 5.2% from main)	94.8% (down 5.2% from main)
New Branch Coverage	100%	100%
New Composite Coverage	84.8%	84.8%
New Line Coverage	84.8%	84.8%

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