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* Muti binder customization Enable applications with multi binders to provide customizations for the binders. This is accomplished by providing a new API called BinderCustomizer. When an implementation is found for this interface, the customizations are applied against the binders before providing access to them. Tests and docs. Resolves https://github.com/spring-cloud/spring-cloud-stream/issues/1541 * Addressing PR review comments * Addressing PR review