feat(perps-controller): add dedicated aggregated order book connection

packages/perps-controller/CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Add `AggregatedOrderBookConnection` service (with the `processAggregatedOrderBook` helper and the `OrderBookConnectionStatus`, `SubscribeAggregatedOrderBookParams`, and `AggregatedOrderBookConnectionOptions` types) for managing a dedicated, reference-counted aggregated order book subscription ([#9549](https://github.com/MetaMask/core/pull/9549))
 - Add `BOTTOM_NAV_BAR` to `PERPS_EVENT_VALUE.SOURCE` for bottom navigation bar analytics attribution ([#9551](https://github.com/MetaMask/core/pull/9551))
 
 ### Changed

packages/perps-controller/src/index.ts

@@ -602,6 +602,15 @@ export {
 // Services (only externally consumed items)
 export { TradingReadinessCache } from './services/TradingReadinessCache';
 export type { ServiceContext } from './services/ServiceContext';
+export {
+  AggregatedOrderBookConnection,
+  processAggregatedOrderBook,
+} from './services/AggregatedOrderBookConnection';
+export type {
+  OrderBookConnectionStatus,
+  SubscribeAggregatedOrderBookParams,
+  AggregatedOrderBookConnectionOptions,
+} from './services/AggregatedOrderBookConnection';
 
 // Removed with Live Market Prices component:
 // - usePerpsPrices