Chore/rm main entity concept (#7709)

**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>

integration-tests/modules/__tests__/shipping-options/workflows/batch-shipping-options-rules.ts

@@ -1,4 +1,4 @@
-import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+import {ModuleRegistrationName} from "@medusajs/modules-sdk"
 import {
   BatchWorkflowInput,
   CreateShippingOptionRuleDTO,
@@ -10,7 +10,7 @@ import {
   ShippingProfileDTO,
   UpdateShippingOptionRuleDTO,
 } from "@medusajs/types"
-import { medusaIntegrationTestRunner } from "medusa-test-utils/dist"
+import {medusaIntegrationTestRunner} from "medusa-test-utils/dist"
 import {
   batchShippingOptionRulesWorkflow,
   createShippingOptionsWorkflow,
@@ -35,7 +35,7 @@ async function createShippingOptionFixture({
     ModuleRegistrationName.REGION
   ) as IRegionModuleService
 
-  const [region] = await regionService.create([
+  const [region] = await regionService.createRegions([
     {
       name: "Test region",
       currency_code: "eur",
@@ -136,7 +136,7 @@ medusaIntegrationTestRunner({
           type: "default",
         })
 
-        fulfillmentSet = await service.create({
+        fulfillmentSet = await service.createFulfillmentSets({
           name: "Test fulfillment set",
           type: "manual_test",
         })

integration-tests/modules/__tests__/shipping-options/workflows/create-shipping-options.ts

@@ -42,7 +42,7 @@ medusaIntegrationTestRunner({
           type: "default",
         })
 
-        fulfillmentSet = await service.create({
+        fulfillmentSet = await service.createFulfillmentSets({
           name: "Test fulfillment set",
           type: "manual_test",
         })
@@ -64,7 +64,7 @@ medusaIntegrationTestRunner({
           ModuleRegistrationName.REGION
         ) as IRegionModuleService
 
-        const [region] = await regionService.create([
+        const [region] = await regionService.createRegions([
           {
             name: "Test region",
             currency_code: "eur",
@@ -180,7 +180,7 @@ medusaIntegrationTestRunner({
           ModuleRegistrationName.REGION
         ) as IRegionModuleService
 
-        const [region] = await regionService.create([
+        const [region] = await regionService.createRegions([
           {
             name: "Test region",
             currency_code: "eur",

integration-tests/modules/__tests__/shipping-options/workflows/delete-shipping-options.ts

@@ -45,7 +45,7 @@ medusaIntegrationTestRunner({
           type: "default",
         })
 
-        fulfillmentSet = await service.create({
+        fulfillmentSet = await service.createFulfillmentSets({
           name: "Test fulfillment set",
           type: "manual_test",
         })
@@ -67,7 +67,7 @@ medusaIntegrationTestRunner({
           ModuleRegistrationName.REGION
         ) as IRegionModuleService
 
-        const [region] = await regionService.create([
+        const [region] = await regionService.createRegions([
           {
             name: "Test region",
             currency_code: "eur",
@@ -150,7 +150,7 @@ medusaIntegrationTestRunner({
           ModuleRegistrationName.REGION
         ) as IRegionModuleService
 
-        const [region] = await regionService.create([
+        const [region] = await regionService.createRegions([
           {
             name: "Test region",
             currency_code: "eur",

integration-tests/modules/__tests__/shipping-options/workflows/update-shipping-options.ts

@@ -46,7 +46,7 @@ medusaIntegrationTestRunner({
           type: "default",
         })
 
-        fulfillmentSet = await service.create({
+        fulfillmentSet = await service.createFulfillmentSets({
           name: "Test fulfillment set",
           type: "manual_test",
         })
@@ -68,7 +68,7 @@ medusaIntegrationTestRunner({
           ModuleRegistrationName.REGION
         ) as IRegionModuleService
 
-        const [region] = await regionService.create([
+        const [region] = await regionService.createRegions([
           {
             name: "Test region",
             currency_code: "eur",
@@ -233,7 +233,7 @@ medusaIntegrationTestRunner({
           ModuleRegistrationName.REGION
         ) as IRegionModuleService
 
-        const [region] = await regionService.create([
+        const [region] = await regionService.createRegions([
           {
             name: "Test region",
             currency_code: "eur",