Deprecate analyze_object

[nfahlgren]

Describe your changes
In PlantCV4 pcv.analyze_object is replaced by pcv.analyze.size

Type of update
Is this a: update

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 #1206 (bbe190b) into release-4.0 (2409888) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           release-4.0     #1206    +/-   ##
==============================================
  Coverage       100.00%   100.00%            
==============================================
  Files              166       165     -1     
  Lines             7163      7045   -118     
==============================================
- Hits              7163      7045   -118     

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

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

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

... and 1 file with indirect coverage changes