ParaRegistration proxy to Polkadot and Kusama (#520)

<!-- Remember that you can run `/merge` to enable auto-merge in the PR
-->

<!-- Remember to modify the changelog. If you don't need to modify it,
you can check the following box.
Instead, if you have already modified it, simply delete the following
line. -->

This adds a new type of Proxy called ParaRegistration to both Kusama and
Polkadot's runtime. This change aids the development of deployment
portals that want to execute actions related to deploying parachains.

The allowed actions on this proxy are:

1. Reserving a paraID.
2. Registering a Parachain.
3. Removing proxy.

---------

Co-authored-by: fellowship-merge-bot[bot] <151052383+fellowship-merge-bot[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -15,6 +15,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Location conversion tests for relays and parachains ([polkadot-fellows/runtimes#487](https://github.com/polkadot-fellows/runtimes/pull/487))
 
+- ParaRegistration proxy for Polkadot and Kusama ([polkadot-fellows/runtimes#520](https://github.com/polkadot-fellows/runtimes/pull/520))
+
 ### Changed
 
 - Kusama Treasury: remove funding to the Kappa Sigma Mu Society and disable burn ([polkadot-fellows/runtimes#507](https://github.com/polkadot-fellows/runtimes/pull/507))

relay/kusama/src/lib.rs

@@ -1143,6 +1143,8 @@ pub enum ProxyType {
 	NominationPools,
 	#[codec(index = 9)]
 	Spokesperson,
+	#[codec(index = 10)]
+	ParaRegistration,
 }
 
 impl Default for ProxyType {
@@ -1247,6 +1249,15 @@ impl InstanceFilter<RuntimeCall> for ProxyType {
 				RuntimeCall::System(frame_system::Call::remark { .. }) |
 					RuntimeCall::System(frame_system::Call::remark_with_event { .. })
 			),
+			ProxyType::ParaRegistration => matches!(
+				c,
+				RuntimeCall::Registrar(paras_registrar::Call::reserve { .. }) |
+					RuntimeCall::Registrar(paras_registrar::Call::register { .. }) |
+					RuntimeCall::Utility(pallet_utility::Call::batch { .. }) |
+					RuntimeCall::Utility(pallet_utility::Call::batch_all { .. }) |
+					RuntimeCall::Utility(pallet_utility::Call::force_batch { .. }) |
+					RuntimeCall::Proxy(pallet_proxy::Call::remove_proxy { .. })
+			),
 		}
 	}
 	fn is_superset(&self, o: &Self) -> bool {

relay/polkadot/src/lib.rs

@@ -1007,6 +1007,7 @@ pub enum ProxyType {
 	CancelProxy = 6,
 	Auction = 7,
 	NominationPools = 8,
+	ParaRegistration = 9,
 }
 
 #[cfg(test)]
@@ -1121,6 +1122,15 @@ impl InstanceFilter<RuntimeCall> for ProxyType {
 					RuntimeCall::Registrar(..) |
 					RuntimeCall::Slots(..)
 			),
+			ProxyType::ParaRegistration => matches!(
+				c,
+				RuntimeCall::Registrar(paras_registrar::Call::reserve { .. }) |
+					RuntimeCall::Registrar(paras_registrar::Call::register { .. }) |
+					RuntimeCall::Utility(pallet_utility::Call::batch { .. }) |
+					RuntimeCall::Utility(pallet_utility::Call::batch_all { .. }) |
+					RuntimeCall::Utility(pallet_utility::Call::force_batch { .. }) |
+					RuntimeCall::Proxy(pallet_proxy::Call::remove_proxy { .. })
+			),
 		}
 	}
 	fn is_superset(&self, o: &Self) -> bool {