Feat(auth): Rename authentication to auth (#6229)

**What**
- rename `authenticationModule` -> `authModule`

packages/utils/src/auth/abstract-auth-provider.ts

@@ -1,7 +1,8 @@
-import { AuthenticationResponse, AuthProviderScope } from "@medusajs/types"
+import { AuthProviderScope, AuthenticationResponse } from "@medusajs/types"
+
 import { MedusaError } from "../common"
 
-export abstract class AbstractAuthenticationModuleProvider {
+export abstract class AbstractAuthModuleProvider {
   public static PROVIDER: string
   public static DISPLAY_NAME: string
   protected readonly scopes_: Record<string, AuthProviderScope>

packages/utils/src/auth/index.ts

@@ -0,0 +1 @@
+export * from "./abstract-auth-provider"

packages/utils/src/authentication/index.ts

@@ -1 +0,0 @@
-export * from "./abstract-authentication-provider"

packages/utils/src/index.ts

@@ -1,4 +1,4 @@
-export * from "./authentication"
+export * from "./auth"
 export * from "./bundles"
 export * from "./common"
 export * from "./dal"