chore(): Reorganize modules (#7210)

**What**
Move all modules to the modules directory

packages/modules/link-modules/src/initialize/module-definition.ts

@@ -0,0 +1,24 @@
+import {
+  JoinerRelationship,
+  ModuleExports,
+  ModuleJoinerConfig,
+} from "@medusajs/types"
+import { getModuleService, getReadOnlyModuleService } from "@services"
+import { getLoaders } from "../loaders"
+
+export function getLinkModuleDefinition(
+  joinerConfig: ModuleJoinerConfig,
+  primary: JoinerRelationship,
+  foreign: JoinerRelationship
+): ModuleExports {
+  return {
+    service: joinerConfig.isReadOnlyLink
+      ? getReadOnlyModuleService(joinerConfig)
+      : getModuleService(joinerConfig),
+    loaders: getLoaders({
+      joinerConfig,
+      primary,
+      foreign,
+    }),
+  }
+}