adding-thermal-dependencies

[annacasto]

Describe your changes
Added exiftools and flirextractor as dependencies for plantcv-extras

Type of update
Is this a:

• New feature or feature enhancement

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

Additional context
FLIR thermal images require exiftools to read thermal jpg metadata and flirextractor is a package for converting thermal jpgs to csv.

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]

Here's the code health analysis summary for commits 8f4ecca..3f0eda8. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	⚠️ Artifact not reported	Timed out: Artifact was never reported	View Check ↗

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