Add a function shapes_to_geojson

[k034b363]

Describe your changes
This function takes a Napari viewer object's shapes layer and saves out a geojson with the geometries from the shapes layer. This is useful for downstream analysis involving rasterstats and also for parallelization with reuse of shape files.

Functions similarly to points_to_geojson but for shapes.

Type of update
Is this a:

• New feature or feature enhancement

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-geospatial/mkdocs.yml
• Changes to function input/output signatures added to changelog.md
• Code reviewed
• PR approved

[deepsource-io]

Here's the code health analysis summary for commits f8cc49f..9ed6582. 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	100%	100%
Line Coverage	100%	100%
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%	100%

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