Add solidity filter

[HaleySchuhl]

Describe your changes A new function that filters objects based on their solidity.

Type of update Is this a:

• New feature
• Work in progress

Associated issues Merge after #1482

Additional context Useful in filtering masks of pollen grains.

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[bot]]

Here's the code health analysis summary for commits 9e989e7..548f49c. 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	99.8% (up 0.1% from main)	99.8% (up 0.1% from main)
Line Coverage	99.8% (up 0.1% from main)	99.8% (up 0.1% from main)
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%, ✅ Above Threshold	100%, ✅ Above Threshold

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[nfahlgren]

Superseded by #1553 I think, but reopen if not