Identity (business-specs 4.3.1 API)

```
@Documented
@Retention(RUNTIME)
@Target({FIELD,ANNOTATION_TYPE})
public @interface Identity
```
This annotation marks the field of an entity as its identity. A generation strategy can be specified with an identity generator.

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  Class<? extends IdentityGenerator> generator

- Element Detail
  - generator
```
Class<? extends IdentityGenerator> generator
```
    Returns:
    
    the identity generator used to generate identity if any.
    
    Default:
    
    org.seedstack.business.domain.IdentityGenerator.class