pub GraphInfo (#20149)

IntoScheduleConfigs has the constraint `T: Schedulable<Metadata =
GraphInfo, GroupMetadata = Chain>`. Making `GraphInfo` public allows
external crates to implement blanket traits for any
`IntoSheduleConfigs`:


```rust
pub struct ScheduleIntoMyTraitMarker;

impl<S, T, M> MyTrait<(ScheduleIntoMyTypeMarker, T, M)> for S
where
  S: 'static + Clone + IntoScheduleConfigs<T, M>,
  T: Schedulable<Metadata = GraphInfo, GroupMetadata = Chain>,
{
}

```

---------

Co-authored-by: Alice Cecile <[email protected]>

Author: mrchantey

crates/bevy_ecs/src/schedule/mod.rs

@@ -10,6 +10,7 @@ mod schedule;
 mod set;
 mod stepping;
 
+pub use self::graph::GraphInfo;
 use self::graph::*;
 pub use self::{condition::*, config::*, executor::*, node::*, schedule::*, set::*};
 pub use pass::ScheduleBuildPass;