fix(exports): ensure resource imports don't require /index (#562)

Author: stainless-app[bot]

src/resources/coupons.ts

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

src/resources/customers.ts

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

src/resources/customers/credits.ts

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

src/resources/dimensional-price-groups.ts

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

src/resources/events.ts

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

src/resources/plans.ts

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

src/resources/prices.ts

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