Expose proxyBeanMethods as an alias on SpringBootConfiguration, SpringBootApplication, and ManagementContextConfiguration

[wilkinsona]

Spring Framework 5.2 allows proxying of @Bean methods to be disabled via an attribute on @Configuration. As things stand, such proxying cannot be disabled when using @SpringBootApplication, @SpringBootConfiguration, or @ManagementContextConfiguration which are all meta-annotated with @Configuration. We should introduce an alias for the proxyBeanMethods attribute of @Configuration to allow proxying to be disabled.