* INT-2277: Register ChResolver & ErrHandler beans
JIRA: https://jira.spring.io/browse/INT-2277
To avoid extra objects at runtime and reuse a central configuration,
register `BeanFactoryChannelResolver` and `MessagePublishingErrorHandler`
bean via `DefaultConfiguringBeanFactoryPostProcessor`
* Use those beans whenever it is necessary via `IntegrationContextUtils`
factory methods against provided `BeanFactory`
* To avoid changes in the non-managed test, those new factories fall
back to a new instance if there is no an appropriate bean in the `beanFactory`
* * Add `Assert.notNull(beanFactory)` to new factory methods
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