Allow configuring more advanced wireless settings

Currently, the router Advanced settings seem pretty lackluster, given there's an omission for things that should be configurable like DTIM Interval, Beacon Interval, RTS Threshold, and Group Key Update Period. Given that Ruijie uses OpenWRT as a base, this configuration should be available. This is useful for cases where battery life of the client is preferred. This would be useful if this can be combined with scheduled configuration to make the client use less battery at night for example