feat: refactor module joiner config and links generation (#7859)

* feat: refactor module joiner config and links generation

* improve typings

* WIP

* WIP

* WIP

* rename type file

* create link config

* finish typings and add utils

* improve links

* WIP typings

* finalize ExportModule utils

* finalize ExportModule utils

* fix: dml tests

* improve and fixes

* simplify typings with id changes

* add toJSON

* multiple fixes and entity builder fixes

* fix currency searchable

* fix tests

* medusa service refactoring

* cleanup

* cleanup and fixes

* make module name optional

* renaming

---------

Co-authored-by: Harminder Virk <virk.officials@gmail.com>

packages/modules/currency/src/models/currency.ts

@@ -1,7 +1,7 @@
 import { model } from "@medusajs/utils"
 
 export default model.define("currency", {
-  code: model.text().primaryKey().searchable(),
+  code: model.text().searchable().primaryKey(),
   symbol: model.text(),
   symbol_native: model.text(),
   name: model.text().searchable(),