chore(): Autoload module resources (#7291)

**What**
- automatically build and consume connection and container loader if not exported by the module
- therefore load the services and repositories automatically, including baseRepository
- automatically build run and revert migrations if not provided
- cleaup modules to remove extra unnecessary bits and pieces
- remove the `initializeFactory` in favor of using `medusaApp`

Should drastically improve the module building DX by removing a lot of boilerplate to handle by the user, that plus the base entity should simplify quite a lot the flow cc @shahednasser 

**Note**
I had to choose a way to identify connection and container loader from the exported loader from the module. I decided to go with named function `connectionLoader` and `containerLoader`, also, now the factories will return named function so if the user use the factories we are providing to build those loaders, the function will also be named and identified

packages/modules/api-key/src/index.ts

@@ -1,14 +1,7 @@
 import { moduleDefinition } from "./module-definition"
-import { initializeFactory, Modules } from "@medusajs/modules-sdk"
 
 export * from "./types"
 export * from "./models"
 export * from "./services"
 
-export const initialize = initializeFactory({
-  moduleName: Modules.API_KEY,
-  moduleDefinition,
-})
-export const runMigrations = moduleDefinition.runMigrations
-export const revertMigration = moduleDefinition.revertMigration
 export default moduleDefinition

packages/modules/api-key/src/module-definition.ts

@@ -1,44 +1,8 @@
 import { ModuleExports } from "@medusajs/types"
-import * as ModuleServices from "@services"
 import { ApiKeyModuleService } from "@services"
-import { Modules } from "@medusajs/modules-sdk"
-import * as Models from "@models"
-import * as ModuleModels from "@models"
-import { ModulesSdkUtils } from "@medusajs/utils"
-import * as ModuleRepositories from "@repositories"
-
-const migrationScriptOptions = {
-  moduleName: Modules.API_KEY,
-  models: Models,
-  pathToMigrations: __dirname + "/migrations",
-}
-
-const runMigrations = ModulesSdkUtils.buildMigrationScript(
-  migrationScriptOptions
-)
-
-const revertMigration = ModulesSdkUtils.buildRevertMigrationScript(
-  migrationScriptOptions
-)
-
-const containerLoader = ModulesSdkUtils.moduleContainerLoaderFactory({
-  moduleModels: ModuleModels,
-  moduleRepositories: ModuleRepositories,
-  moduleServices: ModuleServices,
-})
-
-const connectionLoader = ModulesSdkUtils.mikroOrmConnectionLoaderFactory({
-  moduleName: Modules.API_KEY,
-  moduleModels: Object.values(Models),
-  migrationsPath: __dirname + "/migrations",
-})
 
 const service = ApiKeyModuleService
-const loaders = [containerLoader, connectionLoader] as any
 
 export const moduleDefinition: ModuleExports = {
   service,
-  loaders,
-  revertMigration,
-  runMigrations,
 }