Spring Avoid CGLIB proxies in websocket/messaging configuration

In order to allow support in native executables and for consistency with the changes done in the whole Spring portfolio, websocket and messaging configurations should be switched to @Configuration(proxyBeanMethods = false) in order to not require CGLIB proxies.

Comment From: sdeleuze

Draft commit: https://github.com/sdeleuze/spring-framework/commit/9e792a4844438a8d17f956f14f6b0cc08eb1f639