Port safe commits from master to polkadot-staging (#2761)

* introduce bp_messages::ChainWithMessages (#2171)

* Move Chain::ID from relay-level Chain to primitives-level Chain (#2181)

* move Chain::ID from relay-level Chain to primitives-level Chain

* removed chain IDs from bp-runtime

* add missing file header

* Some code grooming (#2276)

* some code grooming: enable warn(missing_docs) for all piblic crates + added missing documentation + removed obsolete clippy/deny workarounds

* removed strange allow + added comment related to other allow

* removed incorrect_clone_impl_on_copy_type which is unknown to CI clippy

bridges/primitives/chain-bridge-hub-cumulus/src/lib.rs

@@ -14,6 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
 
+//! Primitives of all Cumulus-based bridge hubs.
+
+#![warn(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
 
 pub use bp_polkadot_core::{
@@ -61,6 +64,7 @@ const MAXIMUM_BLOCK_WEIGHT: Weight = Weight::from_parts(constants::WEIGHT_REF_TI
 pub const AVERAGE_ON_INITIALIZE_RATIO: Perbill = Perbill::from_percent(5);
 
 parameter_types! {
+	/// Size limit of the Cumulus-based bridge hub blocks.
 	pub BlockLength: limits::BlockLength = limits::BlockLength::max_with_normal_ratio(
 		5 * 1024 * 1024,
 		NORMAL_DISPATCH_RATIO,
@@ -73,6 +77,7 @@ parameter_types! {
 	pub const ExtrinsicBaseWeight: Weight = Weight::from_parts(constants::WEIGHT_REF_TIME_PER_NANOS, 0)
 		.saturating_mul(125_000);
 
+	/// Weight limit of the Cumulus-based bridge hub blocks.
 	pub BlockWeights: limits::BlockWeights = limits::BlockWeights::builder()
 		.base_block(BlockExecutionWeight::get())
 		.for_class(DispatchClass::all(), |weights| {