Homekit camera

[stickpin]

Proposed change

Add camera support to the HomeKit integration. Based on camera accessory from pyhap.

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
stream:

ffmpeg:

camera:
  - platform: ffmpeg
    name: FfmpegCam
    input: http://some/ffmpeg-compatible/stream
  - platform: mjpeg
    name: MjpegCam
    mjpeg_url: http://mjpeg/webcam/?action=stream
    still_image_url: http://mjpeg/webcam/?action=snapshot
  - platform: generic
    name: StreamCam
    still_image_url: http://rtsphost/screenshot
    stream_source: rtsp://rtsphost:8555/unicast

homekit:
  name: Cam Bridge
  entity_config:
    camera.mjpegcam:
      # Required since mjpeg camera doesn't support stream_source()
      stream_source: http://mjpeg/webcam/?action=stream
    camera.ffmpegcam:
      # Set maximums for negotiating resolutions
      max_fps: 15
      max_width: 640
      max_height: 480
      video_codec: copy
    camera.streamcam:
      # IP address from which ffmpeg will stream to rtp, if different
      stream_address: 10.0.0.1
      # Can override stream_source for camera types that provide it
      stream_source: rtsp://rtsphost:8555/another-stream
      # Opt-in only audio support
      support_audio: True

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Add homekit camera docs home-assistant.io#12303

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

[probot-home-assistant]

Hey there @bdraco, mind taking a look at this pull request as its been labeled with a integration (homekit) you are listed as a codeowner for? Thanks!
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