process enqueued messages on idle

prdoc/pr_3844.prdoc

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+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Add the ability for MessageQueue to process enqueued messages on idle
+
+doc:
+  - audience: Runtime Dev
+    description: |
+        Add the option to use remaining weight on idle for processing enqueued messages.
+        This will increase the changes of the messages enqueued during inherent extrinsics to be processed in the same block. 
+        New config types is added on the message-queue `Config` trait:
+        - `IdleMaxServiceWeight`
+
+    example:
+        ```rust
+        parameter_types! {
+            // The maximum weight to be used from remaining weight for processing enqueued messages on idle
+            pub const IdleMaxServiceWeight: Weight = Some(Weight);
+        }
+
+        type IdleMaxServiceWeight = IdleMaxServiceWeight; // or `()` to not use this feature
+        ```
+
+crates:
+    - name: pallet-message-queue