Description
We would like to keep the intent in our redirection component, hence we have to introduce a new kind of Mapping Type: `Alias`.
- Add it to the Type enumeration - and update the corresponding tests.
- Modify the RecipientRewriteTable class so that I can add - remove alias mappings - and update the corresponding tests (CRUD).
new `Alias` type should be located in `org.apache.james.rrt.lib.Mapping.Type`