Introduce a new resource, `SiderolinkConfig`, to store SideroLink connection configuration (api endpoint for now).
Introduce a controller for this resource which populates it from the Kernel cmdline.
Rework the SideroLink `ManagerController` to take this new resource as input and reconfigure the link on changes.
Additionally, if the siderolink connection is lost, reconnect to it and reconfigure the links/addresses.
Closessiderolabs/talos#7142, siderolabs/talos#7143.
Signed-off-by: Utku Ozdemir <utku.ozdemir@siderolabs.com>
