feat: Add github authentication provider (#8980)

* feat: Add github authentication provider

* feat: Change callback to always return a token, expect callbackUrl to point to FE

* fix: Return login redirect URLas a 200 response

packages/modules/providers/auth-github/src/index.ts

@@ -0,0 +1,10 @@
+import { ModuleProviderExports } from "@medusajs/types"
+import { GithubAuthService } from "./services/github"
+
+const services = [GithubAuthService]
+
+const providerExport: ModuleProviderExports = {
+  services,
+}
+
+export default providerExport