fix: get hierarchy children (#614)

* fix: GetHierarchyChildren was returning the wrong resource type

It was returning Hierarchy but should be returning Node.

* feat: exposing catalog types

* fix: removed unused import

* feat: added get product by node catalog endpoint

https://documentation.elasticpath.com/commerce-cloud/docs/api/pcm/catalogs/releases/products/get-products-by-node.html

src/moltin.d.ts

@@ -71,6 +71,7 @@ export * from './types/flow'
 export * from './types/transaction'
 export * from './types/settings'
 export * from './types/promotions'
+export * from './types/catalog'
 export * from './types/catalogs'
 export * from './types/catalogs-nodes'
 export * from './types/catalogs-products'

src/types/catalog.d.ts

@@ -83,6 +83,11 @@ export interface NodesCatalogEndpoint
     nodeId: string
     token?: string
   }): Promise<ResourceList<Node>>
+
+  GetNodeProducts(options: {
+    nodeId: string
+    token?: string
+  }): Promise<ResourceList<ProductResponse>>
 }
 
 export interface HierarchiesCatalogEndpoint
@@ -103,7 +108,7 @@ export interface HierarchiesCatalogEndpoint
   GetHierarchyChildren(options: {
     hierarchyId: string
     token?: string
-  }): Promise<ResourceList<Hierarchy>>
+  }): Promise<ResourceList<Node>>
 
   GetHierarchyNodes(options?: {
     token?: string

src/types/pcm-variations.ts

@@ -10,7 +10,6 @@ import {
   Resource,
   ResourceList, ResourcePage,
 } from './core'
-import {PcmProduct} from "./pcm";
 
 
   /**