JIRA: https://jira.spring.io/browse/INT-3337
INT-3337: Addressing PR comments
INT-3337: Add support to store/read Messages
* Add support to store/read `ErrorMessage`. As a trick for `Throwable` is selected (de)serializing converter
INT-3337: Add converters for `Message<?>` impls
INT-3337: Make `MDbMS.MessageWrapper` AuditAware
Add `_id` persistence field
Addressing PR comments
Polishing
- Docs
- Check for null ApplicationContext
- Add afterPropertiesSet() to tests
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