Implement System::system_metas(&self) and System::system_metas_mut(&mut self)

for system exploration and configuration

Part of #16168

Author: Rajveer100

crates/bevy_ecs/src/system/adapter_system.rs

@@ -208,6 +208,14 @@ where
     fn set_last_run(&mut self, last_run: crate::component::Tick) {
         self.system.set_last_run(last_run);
     }
+
+    fn system_metas(&self) -> &super::SystemMeta {
+        todo!()
+    }
+
+    fn system_metas_mut(&mut self) -> &mut super::SystemMeta {
+        todo!()
+    }
 }
 
 // SAFETY: The inner system is read-only.

crates/bevy_ecs/src/system/combinator.rs

@@ -253,6 +253,14 @@ where
         self.a.set_last_run(last_run);
         self.b.set_last_run(last_run);
     }
+
+    fn system_metas(&self) -> &super::SystemMeta {
+        todo!()
+    }
+
+    fn system_metas_mut(&mut self) -> &mut super::SystemMeta {
+        todo!()
+    }
 }
 
 /// SAFETY: Both systems are read-only, so any system created by combining them will only read from the world.
@@ -476,6 +484,14 @@ where
         self.a.set_last_run(last_run);
         self.b.set_last_run(last_run);
     }
+
+    fn system_metas(&self) -> &super::SystemMeta {
+        todo!()
+    }
+
+    fn system_metas_mut(&mut self) -> &mut super::SystemMeta {
+        todo!()
+    }
 }
 
 /// SAFETY: Both systems are read-only, so any system created by piping them will only read from the world.

crates/bevy_ecs/src/system/exclusive_function_system.rs

@@ -184,6 +184,14 @@ where
     fn set_last_run(&mut self, last_run: Tick) {
         self.system_meta.last_run = last_run;
     }
+
+    fn system_metas(&self) -> &SystemMeta {
+        &self.system_meta
+    }
+
+    fn system_metas_mut(&mut self) -> &mut SystemMeta {
+        &mut self.system_meta
+    }
 }
 
 /// A trait implemented for all exclusive system functions that can be used as [`System`]s.

crates/bevy_ecs/src/system/function_system.rs

@@ -815,6 +815,14 @@ where
     fn set_last_run(&mut self, last_run: Tick) {
         self.system_meta.last_run = last_run;
     }
+
+    fn system_metas(&self) -> &SystemMeta {
+        &self.system_meta
+    }
+
+    fn system_metas_mut(&mut self) -> &mut SystemMeta {
+        &mut self.system_meta
+    }
 }
 
 /// SAFETY: `F`'s param is [`ReadOnlySystemParam`], so this system will only read from the world.

crates/bevy_ecs/src/system/system.rs

@@ -14,7 +14,7 @@ use crate::{
 use alloc::borrow::Cow;
 use core::any::TypeId;
 
-use super::IntoSystem;
+use super::{IntoSystem, SystemMeta};
 
 /// An ECS system that can be added to a [`Schedule`](crate::schedule::Schedule)
 ///
@@ -163,6 +163,12 @@ pub trait System: Send + Sync + 'static {
     /// However, it can be an essential escape hatch when, for example,
     /// you are trying to synchronize representations using change detection and need to avoid infinite recursion.
     fn set_last_run(&mut self, last_run: Tick);
+
+    /// .
+    fn system_metas(&self) -> &SystemMeta;
+
+    /// .
+    fn system_metas_mut(&mut self) -> &mut SystemMeta;
 }
 
 /// [`System`] types that do not modify the [`World`] when run.