Add proper equals (and hashCode) methods to OAuth2AuthorizationRequest

[GrmpfNarf]

Expected Behavior

The class org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationRequest should have proper equals and hashCode methods.

Current Behavior

The class does not have an overriden equals or hashCode method which makes proper comparison of two instances difficult.

Context
I save this class into a database and read it back with JPA and Hibernate. This is done in some customization of the project:
spring-authorization-server.
However, Hibernate has the funcationality to detect changes in an entity and send an update to this entity to the database. For this function the equals method of custom types is called. Hibernate holds a copy of the entity in cache and compare this one with the one delivered to the application.
Because of the missing proper equals method of the given class an update is triggered everytime the entity is read from the database.
I understand that this may be a special case in comibnation with Hibernate but the lack of the method ensures that comparisons are maybe not accurate enough.

Workaround
To prevent this issue i wrap a custom datatype around the OAuth2AuthorizationRequest which adds the missing equals functionality.