Introduce async_add_assistant_content to conversation chat log

[balloob]

Breaking change

Proposed change

async_add_assistant_content is an async generator that returns tool results as they are generated. In half the cases, this method is not needed as we know there are no tool calls in the content. This adds a new method for these cases.

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:
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• Link to frontend pull request:

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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 (assist_satellite) you are listed as a code owner for? Thanks!

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