Add image entity component

[emontnemery]

Proposed change

Add image entity component

This is a greatly simplified version of camera which only supports serving a static image.

Frontend support: home-assistant/frontend#16877

In follow-up PRs:

• Add an integration similar to generic camera for displaying an image from a URL
  • A candidate for this is to add an image platform to the template integration
• Add MQTT support: Add mqtt image platform #94769

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Improve handling of svg still images in generic camera #80810
• Link to documentation pull request:
  • Document image entity home-assistant.io#27851
  • Document image entity developers.home-assistant#1802

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
• I have followed the perfect PR recommendations
• 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.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[allenporter]

I like this simpler standalone image entity! I'm curious to understand the plan for the existing camera or even just generic specifically. The PR description mentions the existing generic camera integration, which my impression can handle this case already, but it brings in other stuff. Is the plan to migrate existing use cases or share implementation? Generally, camera has no path for evolution and is kind of stuck as some virtual entity thing but it's really doing too much and is effectively multiple separate Image + Video Stream entities. I didn't see an architecture discussion for this, so just generally curious about the implications or why why its fine to leave generic behind.

[emontnemery]

I like this simpler standalone image entity! I'm curious to understand the plan for the existing camera or even just generic specifically. The PR description mentions the existing generic camera integration, which my impression can handle this case already, but it brings in other stuff. Is the plan to migrate existing use cases or share implementation? Generally, camera has no path for evolution and is kind of stuck as some virtual entity thing but it's really doing too much and is effectively multiple separate Image + Video Stream entities. I didn't see an architecture discussion for this, so just generally curious about the implications or why why its fine to leave generic behind.

The driver for this PR is integrations using the camera entity for things like #80810, modeling that as a "camera" is a really poor fit.

The reference to the generic camera was to provide the means for a user to set up an image entity based on, for example, a URL, similar to how the generic camera allows setting up a camera entity by the user providing URLs for an image or a stream.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

Learn more about our pull request process.

[frenck]

Looks good to me 👍

../Frenck