OS-Agent support (#2811)

* OS-Agent support

* add agent to host feature

* Add support for os-agent on devcontainer

* Rename core

* fix tests

* add setter

* add cgroup / apparmor

* all interfaces added

* fix import

* Add tests

* More tests

* Finish tests

* reformating xml files

* fix doc string

* address comments

* change return value

* fix tests

* Update supervisor/dbus/agent/__init__.py

Co-authored-by: Joakim Sørensen <joasoe@gmail.com>

* Update scripts/supervisor.sh

Co-authored-by: Joakim Sørensen <joasoe@gmail.com>

Co-authored-by: Joakim Sørensen <joasoe@gmail.com>

tests/dbus/agent/test_agent.py

@@ -0,0 +1,15 @@
+"""Test OSAgent dbus interface."""
+
+from supervisor.coresys import CoreSys
+
+
+async def test_dbus_osagent(coresys: CoreSys):
+    """Test coresys dbus connection."""
+    assert coresys.dbus.agent.version is None
+    assert coresys.dbus.agent.diagnostics is None
+
+    await coresys.dbus.agent.connect()
+    await coresys.dbus.agent.update()
+
+    assert coresys.dbus.agent.version == "1.1.0"
+    assert coresys.dbus.agent.diagnostics