Rococo & Westend People Chain (#2281)

Rococo and Westend runtimes for the "People Chain". This chain contains
the Identity pallet with plans to migrate all related data from the
Relay Chain.

Changes `IdentityInfo` to:

- Remove `additional_fields`.
- Add `github` and `discord` as first class fields. From scraping chain
data, these were the only two additional fields used (for the Fellowship
and Ambassador Program, respectively).
- Rename `riot` to `matrix`.

Note: This will use the script in
https://github.com/paritytech/polkadot-sdk/pull/2025 to generate the
genesis state.

TODO:

- [x] https://github.com/paritytech/polkadot-sdk/pull/1814 and
integration of the Identity Migrator pallet for migration.
- [x] Tests: https://github.com/paritytech/polkadot-sdk/pull/2373

---------

Co-authored-by: Muharem <ismailov.m.h@gmail.com>
Co-authored-by: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Co-authored-by: Dónal Murray <donal.murray@parity.io>
Co-authored-by: Richard Melkonian <35300528+0xmovses@users.noreply.github.com>
Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>

cumulus/xcm/xcm-emulator/src/lib.rs

@@ -59,9 +59,13 @@ pub use polkadot_runtime_parachains::inclusion::{AggregateMessageOrigin, UmpQueu
 
 // Polkadot
 pub use polkadot_parachain_primitives::primitives::RelayChainBlockNumber;
-pub use xcm::v3::prelude::{
-	Ancestor, MultiAssets, MultiLocation, Parachain as ParachainJunction, Parent, WeightLimit,
-	XcmHash, X1,
+use sp_core::crypto::AccountId32;
+pub use xcm::{
+	prelude::{AccountId32 as AccountId32Junction, Here},
+	v3::prelude::{
+		Ancestor, MultiAssets, MultiLocation, Parachain as ParachainJunction, Parent, WeightLimit,
+		XcmHash, X1,
+	},
 };
 pub use xcm_executor::traits::ConvertLocation;
 
@@ -1437,6 +1441,41 @@ pub struct TestArgs {
 	pub weight_limit: WeightLimit,
 }
 
+impl TestArgs {
+	/// Returns a [`TestArgs`] instance to be used for the Relay Chain across integration tests.
+	pub fn new_relay(dest: MultiLocation, beneficiary_id: AccountId32, amount: Balance) -> Self {
+		Self {
+			dest,
+			beneficiary: AccountId32Junction { network: None, id: beneficiary_id.into() }.into(),
+			amount,
+			assets: (Here, amount).into(),
+			asset_id: None,
+			fee_asset_item: 0,
+			weight_limit: WeightLimit::Unlimited,
+		}
+	}
+
+	/// Returns a [`TestArgs`] instance to be used for parachains across integration tests.
+	pub fn new_para(
+		dest: MultiLocation,
+		beneficiary_id: AccountId32,
+		amount: Balance,
+		assets: MultiAssets,
+		asset_id: Option<u32>,
+		fee_asset_item: u32,
+	) -> Self {
+		Self {
+			dest,
+			beneficiary: AccountId32Junction { network: None, id: beneficiary_id.into() }.into(),
+			amount,
+			assets,
+			asset_id,
+			fee_asset_item,
+			weight_limit: WeightLimit::Unlimited,
+		}
+	}
+}
+
 /// Auxiliar struct to help creating a new `Test` instance
 pub struct TestContext<T, Origin: Chain, Destination: Chain> {
 	pub sender: AccountIdOf<Origin::Runtime>,