Westend: Fellowship Treasury (#2532)

Treasury Pallet Instance for the Fellowship in Westend Collectives.

In this update, we present a Treasury Pallet Instance that is under the
control of the Fellowship body, with oversight from the Root and
Treasurer origins. Here's how it is governed:
- the Root origin have the authority to reject or approve spend
proposals, with no amount limit for approvals.
- the Treasurer origin have the authority to reject or approve spend
proposals, with approval limits of up to 10,000,000 DOT.
- Voice of all Fellows ranked at 3 or above can reject or approve spend
proposals, with a maximum approval limit of 10,000 DOT.
- Voice of Fellows ranked at 4 or above can also reject or approve spend
proposals, with a maximum approval limit of 10,000,000 DOT.

Additionally, we introduce the Asset Rate Pallet Instance to establish
conversion rates from asset A to B. This is used to determine if a
proposed spend amount involving a non-native asset is permissible by the
commanding origin. The rates can be set up by the Root, Treasurer
origins, or Voice of all Fellows.

---------

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: joepetrowski <joe@parity.io>

cumulus/parachains/runtimes/assets/asset-hub-westend/src/xcm_config.rs

@@ -239,6 +239,18 @@ match_types! {
 		MultiLocation { parents: 1, interior: Here } |
 		MultiLocation { parents: 1, interior: X1(Plurality { .. }) }
 	};
+	pub type FellowshipEntities: impl Contains<MultiLocation> = {
+		// Fellowship Plurality
+		MultiLocation { parents: 1, interior: X2(Parachain(1001), Plurality { id: BodyId::Technical, ..}) } |
+		// Fellowship Salary Pallet
+		MultiLocation { parents: 1, interior: X2(Parachain(1001), PalletInstance(64)) } |
+		// Fellowship Treasury Pallet
+		MultiLocation { parents: 1, interior: X2(Parachain(1001), PalletInstance(65)) }
+	};
+	pub type AmbassadorEntities: impl Contains<MultiLocation> = {
+		// Ambassador Salary Pallet
+		MultiLocation { parents: 1, interior: X2(Parachain(1001), PalletInstance(74)) }
+	};
 }
 
 /// A call filter for the XCM Transact instruction. This is a temporary measure until we properly
@@ -487,6 +499,8 @@ pub type Barrier = TrailingSetTopicAsId<
 						ParentOrParentsPlurality,
 						Equals<RelayTreasuryLocation>,
 						Equals<bridging::SiblingBridgeHub>,
+						FellowshipEntities,
+						AmbassadorEntities,
 					)>,
 					// Subscriptions for version tracking are OK.
 					AllowSubscriptionsFrom<Everything>,
@@ -525,6 +539,8 @@ pub type ForeignAssetFeeAsExistentialDepositMultiplierFeeCharger =
 pub type WaivedLocations = (
 	RelayOrOtherSystemParachains<AllSiblingSystemParachains, Runtime>,
 	Equals<RelayTreasuryLocation>,
+	FellowshipEntities,
+	AmbassadorEntities,
 );
 
 /// Cases where a remote origin is accepted as trusted Teleporter for a given asset: