Moved all Querydsl related bean definitions and customizations to a dedicated configuration class that only gets included if Querydsl is on the classpath.
Extracted a QuerydslActivator for use in Spring Data REST, which uses HateoasAwareSpringDataWebConfiguration via inheritance, not via @EnableSpringDataWebSupport.
Previously, we exposed a QuerydslBindingsFactory as bean method return type which breaks Spring bootstrap even if it's lazy due to its references to Querydsl types.
Related tickets: DATACMNS-669.
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