INT-3326: Add `GlobalChannelInterceptor` annotation

JIRA: https://jira.spring.io/browse/INT-3326
INT-3326: Add parent-child test
INT-3326: Fix `ClassCastException` for `GCII`
INT-3326: Rebase and Polishing
INT-3326: Fix `GCII` for `getBeanNamesForType`
INT-3326 Polishing Doc, JavaDocs

Also fix a typo in the bean name for the CI processor.