Camel 4.21 - Generate route diagrams as part of testing

[davsclaus]

Describe the feature here

apache/camel#23085

CSB example
https://github.com/apache/camel-spring-boot-examples/tree/main/spring-boot

I think something may need to be added to CEQ camel-test kit to make it possible in a similar style as CSB to make a special unit test class to be responsible for generating and dumping the routes to a folder.