Implement native inventory manager workflows (#62)

crates/libremetaverse/src/network_manager.rs

@@ -1216,6 +1216,10 @@ impl Simulator {
             .map(|inner| Caps::native_from_inner(inner, self.native_clone_without_caps()))
     }
 
+    pub(crate) fn native_id(&self) -> UUID {
+        self.data.id
+    }
+
     pub(crate) fn native_from_weak(data: &Weak<SimulatorData>) -> Option<Self> {
         data.upgrade().map(|data| Self { caps: None, data })
     }