Feat/mikro orm based linkable (#7944)

**What**
- Generate simple linkable for mikro orm based modules 
- fix module util
- fix joiner config builder
- fix define link relationship extension
- fix migrations not loading custom links

packages/medusa/src/commands/migrate.ts

@@ -2,6 +2,8 @@ import Logger from "../loaders/logger"
 import { migrateMedusaApp, revertMedusaApp } from "../loaders/medusa-app"
 import { initializeContainer } from "../loaders"
 import { ContainerRegistrationKeys } from "@medusajs/utils"
+import { getResolvedPlugins } from "../loaders/helpers/resolve-plugins"
+import { resolvePluginsLinks } from "../loaders/helpers/resolve-plugins-links"
 
 const main = async function ({ directory }) {
   const args = process.argv
@@ -10,17 +12,25 @@ const main = async function ({ directory }) {
   args.shift()
 
   const container = await initializeContainer(directory)
+
   const configModule = container.resolve(
     ContainerRegistrationKeys.CONFIG_MODULE
   )
 
+  const plugins = getResolvedPlugins(directory, configModule, true) || []
+  const pluginLinks = await resolvePluginsLinks(plugins, container)
+
   if (args[0] === "run") {
-    await migrateMedusaApp({ configModule, container })
+    await migrateMedusaApp({
+      configModule,
+      linkModules: pluginLinks,
+      container,
+    })
 
     Logger.info("Migrations completed.")
     process.exit()
   } else if (args[0] === "revert") {
-    await revertMedusaApp({ configModule, container })
+    await revertMedusaApp({ configModule, linkModules: pluginLinks, container })
 
     Logger.info("Migrations reverted.")
   } else if (args[0] === "show") {

packages/medusa/src/loaders/medusa-app.ts

@@ -48,8 +48,8 @@ export function mergeDefaultModules(
     const orignalDef = value?.definition
     if (isObject(orignalDef)) {
       value.definition = {
-        ...orignalDef,
         ...def,
+        ...orignalDef,
       }
     }
   }