Allow two Parachains to swap (#4772)

* add support for parachain to parachain swap

* enable swaps on kusama

* sanity test in paras_registrar

* express more errors

* finish up tests

* fmt

* make fields pub

* refactor integration tests to use real accounts

* Update Crowdloan Account to FundIndex (#4824)

* update fund account to use index

* fix integration tests

* Update runtime/common/src/crowdloan.rs

* finish parachain swap test

* format

* fix warning

* fix spacing

* fix formatting

* write migrations

* add migration

* fixes

* more fixes to migration

* Update runtime/common/src/crowdloan/mod.rs

Co-authored-by: Zeke Mostov <z.mostov@gmail.com>

* Update runtime/common/src/paras_registrar.rs

* Update migration.rs

* extract swap function

Co-authored-by: Zeke Mostov <z.mostov@gmail.com>

polkadot/runtime/westend/src/lib.rs

@@ -1084,11 +1084,29 @@ pub type Executive = frame_executive::Executive<
 	frame_system::ChainContext<Runtime>,
 	Runtime,
 	AllPalletsWithSystem,
-	(SessionHistoricalPalletPrefixMigration, SchedulerMigrationV3),
+	(SessionHistoricalPalletPrefixMigration, SchedulerMigrationV3, CrowdloanIndexMigration),
 >;
 /// The payload being signed in transactions.
 pub type SignedPayload = generic::SignedPayload<Call, SignedExtra>;
 
+// Migration for crowdloan pallet to use fund index for account generation.
+pub struct CrowdloanIndexMigration;
+impl OnRuntimeUpgrade for CrowdloanIndexMigration {
+	fn on_runtime_upgrade() -> frame_support::weights::Weight {
+		crowdloan::migration::crowdloan_index_migration::migrate::<Runtime>()
+	}
+
+	#[cfg(feature = "try-runtime")]
+	fn pre_upgrade() -> Result<(), &'static str> {
+		crowdloan::migration::crowdloan_index_migration::pre_migrate::<Runtime>()
+	}
+
+	#[cfg(feature = "try-runtime")]
+	fn post_upgrade() -> Result<(), &'static str> {
+		crowdloan::migration::crowdloan_index_migration::post_migrate::<Runtime>()
+	}
+}
+
 // Migration for scheduler pallet to move from a plain Call to a CallOrHash.
 pub struct SchedulerMigrationV3;