Add OpenAI conversation entity

[balloob]

Breaking change

Proposed change

Add a conversation entity to the OpenAI integration. This is backwards compatible as we still register the agent too, so no migration path has been included.

To do

• migrate assist pipeline to use entity?
• Unique Id to avoid changing entity id

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:
• 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
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format 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.

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[home-assistant]

Hey there @home-assistant/core, @synesthesiam, mind taking a look at this pull request as it has been labeled with an integration (conversation) you are listed as a code owner for? Thanks!

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[allenporter]

There is a hassfest error.

Add tests for the new APIs? Would be good to exercise the prompt override.

[balloob]

The new APIs are tested by changing the agent ID from using the config entry to the entity ID.

[allenporter]

The new APIs are tested by changing the agent ID from using the config entry to the entity ID.

I mean the new prompt field which I think doesn't exist in the old API.

[balloob]

I didn't change the API, just move the code around.

[allenporter]

Apologies, i misread the "raw_prompt" code and made some assumptions about how i wanted it to work.

[allenporter]

There is a hassfest error.

Still hassfest error:

Error: R] [MANIFEST] Domain should not have an IoT Class

[balloob]

Yeah, I have some changes locally but need to figure out the migration first. I thought that I could avoid it, but I cannot.

[MartinHjelmare]

Don't pass in hass.