* Support nullable `org.springframework.web.multipart.MultipartFile` in Kotlin Spring generator
- nullable is only supported for MultipartFile. However, Array<MultipartFile> could be also nullable
* Support nullable `org.springframework.web.multipart.MultipartFile` in Kotlin Spring generator
* Support nullable `org.springframework.web.multipart.MultipartFile` in Kotlin Spring generator
Update kotlin-spring-additionalproperties samples
* add basic implementation and tests
* improve test a bit
* modify kotlin-spring.md
* add x-kotlin-implements also to enum
* update samples & properly define implemented vendor extension
* use enum.getName() instead of hardcoded string as key in vendor extension map
* fix docs
* fix test openapi spec and test
* add samples for x-kotlin-implements
* add samples for x-kotlin-implements to proper output folder
* fix
* revert unwanted changes
* move to correct place
* fix mustache template
* add to samples-kotlin-server.yaml
* reuse 1 open api schema for everything. Add also case where interface extends interface.
* add warn logs when x-kotlin-implements-fields is used without x-kotlin-implements to improve usability
* remove unnecessary generated files
* remove unnecessary generated files
* remove "status" inner enum from Pet as it fails to properly import as Pet.Status in implementations. This is a separate bug - not caused by x-kotlin-implements
