add bean resolution support for expression based header-enrichers [INT-1191]

**[Mark Fisher](https://jira.spring.io/secure/ViewProfile.jspa?name=mark.fisher)** opened **[INT-1191](https://jira.spring.io/browse/INT-1191?redirect=false)** and commented

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**Affects:** 2.0 M4

This issue is a sub-task of #5189
