This is mostly refactoring to adapt to the new APIs.
There are some small changes which are not user-visible immediately (but
visible when using `talosctl get` to inspect low-level details):
* `extras` namespace is removed, it was a hack to distinguish extra and
system manifests
* `Manifests` are managed by two controllers as shared outputs, stored
in the `controlplane` namespace now
* `talosctl inspect dependencies` output got slightly changed
* resources now have `md.owner` set to the controller name which manages
the resource
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
