* Revert "v7.12.0 release"
This reverts commit 073723cb4d41187f839fbb46565d109293fa22d7.
* set version to v7.13.0-SNAPSHOT
* update samples
* update doc
* Adds @Nullable annotation to Spring Boot generator
* issue-14427: [REQ][spring] Null-Safety annotations
* issue-17382: [REQ] spring generator add Nullable annotations
Motivations:
* Have Spring Boot generator client properly annotated for nullability to be able to check code using them with tools like NullAway
* As it is related to Spring then the `org.springframework.lang.Nullable` annotation was chosen to avoid discussion which `@Nullable` one is true one
* `@NonNull` wasn't used as I didn't see much benefit of it. Anyhow, an empty constructor and/or setters allow to put a `null` value there
Modifications:
* Adds nullableAnnotation template to handle nullability annotation on vars
* Adjust pojo templates to use the nullability template
* Adapts tests
Modifications:
* Runs export_docs_generator.sh script to update samples
* samples update
* excludes Spring @Nullable from java-camel
* ones with defaults shouldn't be annotated as @Nullable
* updates samples
* adds AllArgConstructor generation tests
* adds container tests
* adding support for useResponseEntity into spring-http-interface java spring generator
* adding samples for @StatusResponse into spring-http-interface java spring generator
* additional changes to sample
additional changes to samples jdk17
* adding sample files
* extra adjustments
* fixing generator version
* fixing status code in samples
* some rollback
* some rollback 2
