Implement PartialOrd and Ord on BoundedSlice and WeakBoundedVec (#11655)

* Implement PartialOrd and Ord on BoundedSlice and WeakBoundedVec

* More implementations of PartialEq and PartialOrd

* cargo fmt

* Fixes

substrate/primitives/runtime/src/bounded/bounded_btree_map.rs

@@ -66,6 +66,11 @@ where
 	K: Ord,
 	S: Get<u32>,
 {
+	/// Create `Self` from `t` without any checks.
+	fn unchecked_from(t: BTreeMap<K, V>) -> Self {
+		Self(t, Default::default())
+	}
+
 	/// Exactly the same semantics as `BTreeMap::retain`.
 	///
 	/// The is a safe `&mut self` borrow because `retain` can only ever decrease the length of the
@@ -344,8 +349,7 @@ where
 		if self.len() > Bound::get() as usize {
 			Err("iterator length too big")
 		} else {
-			Ok(BoundedBTreeMap::<K, V, Bound>::try_from(self.collect::<BTreeMap<K, V>>())
-				.expect("length checked above; qed"))
+			Ok(BoundedBTreeMap::<K, V, Bound>::unchecked_from(self.collect::<BTreeMap<K, V>>()))
 		}
 	}
 }