scrimlet-reconcilers: add uplinkd SMF reconciler

[jgallagher]

This is effectively moving code around from within sled-agent, but it's still part of the #10167 umbrella project: sync_switch_configuration, in addition to talking to mgd/dpd, talks to sled-agent to trigger SMF property updates:

omicron/nexus/src/app/background/tasks/sync_switch_configuration.rs

Lines 472 to 482 in 2340477

	info!(
	&log,
	"applying SMF config uplink updates to switch zone";
	"switch_slot" => ?switch_slot,
	"config" => ?config,
	);
	if let Err(e) = client
	.uplink_ensure(&sled_agent_client::types::SwitchPorts {
	uplinks: config.clone(),
	})
	.await

This PR adds a reconciler that updates the uplinkd SMF properties. It uses scuffle, but should be consistent with the existing sled-agent implementation, although with many fewer zlogin oxz_switch svcprop ... since it talks directly to the SMF database in the zone.