feat(index): Index module foundation (#9095)

**What**
Index module foundation

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

packages/modules/index/mikro-orm.config.dev.ts

@@ -0,0 +1,6 @@
+import { defineMikroOrmCliConfig, Modules } from "@medusajs/utils"
+import * as entities from "./src/models"
+
+export default defineMikroOrmCliConfig(Modules.INDEX, {
+  entities: Object.values(entities),
+})