Add a EntityConverter for mapping between entity identifiers and entity references [SPR-6374]

[spring-projects-issues]

Keith Donald opened SPR-6374 and commented

Needed by Roo.
Proposal:

• When binding a String entity id to a entity reference field, look for a static method on entityType named find<EntityName>(<IdType> id). If found, invoke that method to load the entity reference
• When printing a entity reference as a field, look for a method named getId() to retrieve fetch the id value, then convert the value to String.

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Affects: 3.0 RC2