Add boards APIs

[mdegat01]

Proposed change

Add /os/boards/{Board} APIs to allow control of board features. Primarily for enabling/disabling LEDs on the yellow board for now but will be used for other things in the future.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to the supervisor)
• 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:
• Link to cli 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
• The code has been formatted using Black (black --fast supervisor tests)
• Tests have been added to verify that the new code works.

If API endpoints of add-on configuration are added/changed:

• Documentation added/updated for developers.home-assistant.io

[mdegat01]

@pvizeli Fixed. Also while I was in there, adopted the pattern used here into agent:

supervisor/supervisor/dbus/manager.py

Lines 86 to 98 in 2947e8e

	@property
	def all(self) -> list[DBusInterface]:
	"""Return all managed dbus interfaces."""
	return [
	self.agent,
	self.systemd,
	self.logind,
	self.hostname,
	self.timedate,
	self.network,
	self.rauc,
	self.resolved,
	]

Figured it was fine to load all these child interfaces in parallel, let me know if that poses a problem.