Make GenericRouterContext pub (#3812)

packages/router/src/lib.rs

@@ -39,7 +39,7 @@ mod contexts {
     pub(crate) mod router;
     pub use navigator::*;
     pub(crate) use router::*;
-    pub use router::{root_router, RouterContext};
+    pub use router::{root_router, GenericRouterContext, RouterContext};
 }
 
 mod router_cfg;