fix(exports): ensure resource imports don't require /index (#717)

Author: stainless-app[bot]

src/resources/beta.ts

@@ -0,0 +1,3 @@
+// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+export * from './beta/index';

src/resources/beta/messages.ts

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+// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+export * from './messages/index';

src/resources/messages.ts

@@ -0,0 +1,3 @@
+// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+export * from './messages/index';