Add name and state to ExecutionService and MultichainRouter (#3058)

This adds a `name` and `state` field to the `ExecutionService` and
`MultichainRouter`, which is required for it to work with modular
initialisation in the MetaMask extension.

Author: Mrtenz

packages/snaps-controllers/src/multichain/MultichainRouter.ts

@@ -114,6 +114,10 @@ type ProtocolSnap = {
 const name = 'MultichainRouter';
 
 export class MultichainRouter {
+  name: typeof name = name;
+
+  state = null;
+
   #messenger: MultichainRouterMessenger;
 
   #withSnapKeyring: WithSnapKeyringFunction;

packages/snaps-controllers/src/services/AbstractExecutionService.ts

@@ -64,6 +64,10 @@ export type TerminateJobArgs<WorkerType> = Partial<Job<WorkerType>> &
 export abstract class AbstractExecutionService<WorkerType>
   implements ExecutionService
 {
+  name: typeof controllerName = controllerName;
+
+  state = null;
+
   #snapRpcHooks: Map<string, SnapRpcHook>;
 
   // Cannot be hash private yet because of tests.

packages/snaps-controllers/src/services/ExecutionService.ts

@@ -12,6 +12,11 @@ type HandleRpcRequest = (
 ) => Promise<unknown>;
 
 export interface ExecutionService {
+  // These fields are required for modular initialisation of the execution
+  // service in the MetaMask extension.
+  name: 'ExecutionService';
+  state: null;
+
   terminateSnap: TerminateSnap;
   terminateAllSnaps: TerminateAll;
   executeSnap: ExecuteSnap;