Add .id shorthand to InstanceInfo

Turn instance.config.get("instance.id") into instance.id.

packages/controller/src/HostConnection.js

@@ -126,7 +126,7 @@ class HostConnection extends BaseConnection {
 		for (let instance of this._controller.instances.values()) {
 			if (instance.config.get("instance.assigned_host") === this._id) {
 				await libLink.messages.assignInstance.send(this, {
-					instance_id: instance.config.get("instance.id"),
+					instance_id: instance.id,
 					serialized_config: instance.config.serialize("host"),
 				});
 			}
@@ -142,7 +142,7 @@ class HostConnection extends BaseConnection {
 				// Check if this instance is assigned somewhere else.
 				if (controllerInstance.config.get("instance.assigned_host") !== this._id) {
 					await libLink.messages.unassignInstance.send(this, {
-						instance_id: controllerInstance.config.get("instance.id"),
+						instance_id: controllerInstance.id,
 					});
 					continue;
 				}