Add sighthound save image

[robmarkcole]

Proposed change

Adds a config option which enables saving of an annotated image. I've not added a test as unsure how to test this safely, looking for recommendations. Docs PR home-assistant/home-assistant.io#11887

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml
image_processing:
  - platform: sighthound
    api_key: my_key
    save_file_folder: /my_dir
    source:
      - entity_id: camera.local_file

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

[robmarkcole]

For discussion, but we probably want to implement save_image on the image processing class, as it is used (in slightly different ways) by doods and tensorflow also

[codecov]

Codecov Report

Merging #31199 into dev will decrease coverage by 0.01%.
The diff coverage is 52.38%.

@@            Coverage Diff             @@
##              dev   #31199      +/-   ##
==========================================
- Coverage   94.67%   94.66%   -0.02%     
==========================================
  Files         763      763              
  Lines       55152    55172      +20     
==========================================
+ Hits        52217    52227      +10     
- Misses       2935     2945      +10

Impacted Files	Coverage Δ
...ssistant/components/sighthound/image_processing.py	86.41% <52.38%> (-11.95%)	⬇️
homeassistant/components/template/cover.py	96.34% <0%> (-1.37%)	⬇️
homeassistant/util/pil.py	30% <0%> (+30%)	⬆️

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[robmarkcole]

Closing as this should really be a convenience method on image_processing