Enable configuring device mount permissions in udev Discovery Handler

[kate-goldenring]

USB devices are mounted by Akri using the device plugin interface. Here is where that is done. By default, read/write/modify permissions are set by the udev discovery handler. These permissions should be configurable for the discovery handler for a Configuration. We'd need to add a new field to the discoveryDetails of the discovery handler here: https://github.com/kate-goldenring/akri/blob/733fae50c1dae6ec8351c92a5e6ba9695ba1f7e1/discovery-handlers/udev/src/discovery_handler.rs#L28-L29