Add websocket command to capture audio from a device

[synesthesiam]

Breaking change

Proposed change

Intended for discussion; tests have not yet been written.

This PR adds a new websocket command: assist_pipeline/device/capture that causes all audio sent to HA from a specific device_id to be forwarded to the websocket client. Limitations are in place to prevent abuse of this command:

• Admin privileges are required
• A maximum of 30 seconds can be recorded at a time
• Only a single capture per device is allowed

With the assist_pipeline/device/capture command, the frontend device page for voice satellites could be extended to include a button to capture audio and play it back. This would make checking audio settings significantly easier than turning on the assist pipeline debug recording feature, which requires restarting HA and is not intended to be left on.

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 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.

[home-assistant]

Hey there @balloob, mind taking a look at this pull request as it has been labeled with an integration (assist_pipeline) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of assist_pipeline can trigger bot actions by commenting:

• @home-assistant close Closes the pull request.
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