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/helpers/create-authenticated-customer.ts

@@ -13,16 +13,20 @@ export const createAuthenticatedCustomer = async (
     ModuleRegistrationName.CUSTOMER
   )
 
-  const customer = await customerModuleService.create({
+  const customer = await customerModuleService.createCustomers({
     first_name: "John",
     last_name: "Doe",
     email: "john@me.com",
     ...customerData,
   })
 
-  const authIdentity = await authService.create({
-    entity_id: "store_user",
-    provider: "emailpass",
+  const authIdentity = await authService.createAuthIdentities({
+    provider_identities: [
+      {
+        entity_id: "store_user",
+        provider: "emailpass",
+      },
+    ],
     app_metadata: {
       customer_id: customer.id,
     },

integration-tests/modules/helpers/create-default-rule-types.ts

@@ -5,7 +5,7 @@ export const createDefaultRuleTypes = async (container) => {
     "pricingModuleService"
   )
 
-  return pricingModuleService.createRuleTypes([
+  return await pricingModuleService.createRuleTypes([
     {
       name: "region_id",
       rule_attribute: "region_id",

integration-tests/modules/helpers/create-variant-price-set.ts

@@ -30,7 +30,7 @@ export const createVariantPriceSet = async ({
     "pricingModuleService"
   )
 
-  const priceSet = await pricingModuleService.create({
+  const priceSet = await pricingModuleService.createPriceSets({
     rules,
     prices,
   })
@@ -40,7 +40,7 @@ export const createVariantPriceSet = async ({
     [Modules.PRICING]: { price_set_id: priceSet.id },
   })
 
-  return await pricingModuleService.retrieve(priceSet.id, {
+  return await pricingModuleService.retrievePriceSet(priceSet.id, {
     relations: ["prices"],
   })
 }