**What**
cleanup and move the feature flag related resources to manage them.
It also include some refactoring around loading and registering the flag as well as not relying on the `glob` package anymore plus some reorganization of the code itself
FIXES FRMW-2625
**What**
Update the `MedusaService` class, factory and types to remove the concept of main modules. The idea being that all method will be explicitly named and suffixes to represent the object you are trying to manipulate.
This pr also includes various fixes in different modules
Co-authored-by: Stevche Radevski <4820812+sradevski@users.noreply.github.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
