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

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

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

@@ -0,0 +1,43 @@
+import { AuthProviderScope, AuthenticationResponse } from "@medusajs/types"
+
+import { MedusaError } from "../common"
+
+export abstract class AbstractAuthModuleProvider {
+  public static PROVIDER: string
+  public static DISPLAY_NAME: string
+  protected readonly scopes_: Record<string, AuthProviderScope>
+
+  public get provider() {
+    return (this.constructor as Function & { PROVIDER: string }).PROVIDER
+  }
+
+  public get displayName() {
+    return (this.constructor as Function & { DISPLAY_NAME: string })
+      .DISPLAY_NAME
+  }
+
+  protected constructor({ scopes }) {
+    this.scopes_ = scopes
+  }
+
+  public validateScope(scope) {
+    if (!this.scopes_[scope]) {
+      throw new MedusaError(
+        MedusaError.Types.INVALID_ARGUMENT,
+        `Scope "${scope}" is not valid for provider ${this.provider}`
+      )
+    }
+  }
+
+  abstract authenticate(
+    data: Record<string, unknown>
+  ): Promise<AuthenticationResponse>
+
+  public validateCallback(
+    data: Record<string, unknown>
+  ): Promise<AuthenticationResponse> {
+    throw new Error(
+      `Callback authentication not implemented for provider ${this.provider}`
+    )
+  }
+}

packages/utils/src/auth/index.ts

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