Provide a way for defining dynamic queries in a type safe way.

[spring-projects-issues]

We can support the creation of dynamic and type safe queries with the following addition:

• Use the Cypher-DSL 2021.1.0 Query-DSL support and provide a Neo4j specific implementation of QuerydslPredicateExecutor
• Provide a native CypherdslConditionExecutor that has basically the same signatures as above, but Cypher-DSL conditions instead of Query-DSL predicates
• Provide CypherdslStatementExecutor and ReactiveCypherdslStatementExecutor that works on full statements and also support projections.

Original ticket was DATAGRAPH-1349

[michael-simons]

Evaluate a way to provide something analog to QuerydslJpaPredicateExecutor and QuerydslJpaRepository like we seen in Spring Data JPA.