Make PendingConfigs storage item public (#5467)

## Description
This PR changes `PendingConfigs` storage item's visibility from crate to
public. This enable us to read it in our runtime.

---------

Co-authored-by: Bastian Köcher <git@kchr.de>

polkadot/runtime/parachains/src/configuration.rs

@@ -557,7 +557,7 @@ pub mod pallet {
 	/// The list is sorted ascending by session index. Also, this list can only contain at most
 	/// 2 items: for the next session and for the `scheduled_session`.
 	#[pallet::storage]
-	pub(crate) type PendingConfigs<T: Config> =
+	pub type PendingConfigs<T: Config> =
 		StorageValue<_, Vec<(SessionIndex, HostConfiguration<BlockNumberFor<T>>)>, ValueQuery>;
 
 	/// If this is set, then the configuration setters will bypass the consistency checks. This

prdoc/pr_5467.prdoc

@@ -0,0 +1,10 @@
+title: Make PendingConfigs storage item public
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      Make PendingConfigs storage item in polkadot's configuration crate public.
+
+crates:
+  - name: polkadot-runtime-parachains
+    bump: minor