Incorporate objects class

[jdavidpeery]

Describe your changes

Beginning to change the usage of contours and hierarchy to using the Objects class.

Type of update

• New feature or feature enhancement
• Work in progress

Associated issues Reference associated issue numbers. Does this pull request close any issues?

Additional context See #911 for the pr that added the Objects class and implemented in in auto_grid and multi

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[bot]]

Codecov Report

Merging #924 (74151dd) into 4.x (696704c) will not change coverage. The diff coverage is 100.00%.

:exclamation: Current head 74151dd differs from pull request most recent head 04a2a2a. Consider uploading reports for the commit 04a2a2a to get more accurate results

@@            Coverage Diff            @@
##               4.x      #924   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          160       160           
  Lines         6827      6809   -18     
=========================================
- Hits          6827      6809   -18     

Flag	Coverage Δ
unittests	100.00% <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)
plantcv/plantcv/transform/color_correction.py	100.00% <100.00%> (ø)
plantcv/utils/sample_images.py	100.00% <0.00%> (ø)
plantcv/plantcv/segment_image_series.py	100.00% <0.00%> (ø)