Add Component::is_entity and is::relation

src/ecs/component.rs

@@ -37,6 +37,18 @@ impl Component {
         unsafe { Flags::from_bits_masked(self.high) }
     }
 
+    #[inline]
+    #[must_use]
+    pub fn is_entity(&self) -> bool {
+        self.flags() == Flags::NONE
+    }
+
+    #[inline]
+    #[must_use]
+    pub fn is_relation(&self) -> bool {
+        self.flags() == Flags::RELATION
+    }
+
     #[inline]
     #[must_use]
     pub fn to_bits(&self) -> u64 {