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/core/utils/src/common/to-camel-case.ts

@@ -1,5 +1,5 @@
 export function toCamelCase(str: string): string {
-  return /^([a-z]+)(([A-Z]([a-z]+))+)$/.test(str)
+  return /^([a-zA-Z]+)(([A-Z]([a-z]+))+)$/.test(str)
     ? str
     : str
         .toLowerCase()