Utilize Objects class in pcv.roi.from_binary_image

[HaleySchuhl]

Describe your changes
More implementation from #945

Docs, tests, and code updated to utilize Objects class

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

[codecov]

Codecov Report

Merging #980 (6cd80be) into release-4.0 (03829b2) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           release-4.0     #980   +/-   ##
============================================
  Coverage        99.98%   99.98%           
============================================
  Files              161      161           
  Lines             6849     6850    +1     
============================================
+ Hits              6848     6849    +1     
  Misses               1        1           

Flag	Coverage Δ
unittests	99.98% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
plantcv/plantcv/roi/roi_methods.py	100.00% <100.00%> (ø)

[JorgeGtz]

Thank you!