Re-add 'spring-boot-configuration-processor' to 'togglz-spring-boot-starter' (#480)
Re-add 'spring-boot-configuration-processor' to 'togglz-spring-boot-starter' (#480)

This dependency was removed with former togglz/spring-boot/autoconfigure project during re-structuring of spring-based-projects after 2.6.1.Final.
It is necessary for the IDE binding between files with `@ConfigurationProperties` and `application.properties` file (e. g.https://github.com/togglz/togglz/blob/master/spring-boot/starter/src/main/java/org/togglz/spring/boot/actuate/autoconfigure/TogglzProperties.java) and therefor quite useful (e. g. auto-completion in `application.properties`)

See: https://docs.spring.io/spring-boot/docs/current/reference/html/appendix-configuration-metadata.html#configuration-metadata-annotation-processor
togglz/togglz,togglz/togglz,togglz/togglz