Fix: Export swimlane IDs to prevent disappearance after import #279
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Problem Description:
Swimlanes disappear after importing or deploying chains because defaultSwimlaneId and reuseSwimlaneId are not exported.
Solution Description:
Added defaultSwimlaneId and reuseSwimlaneId to the export in ChainExternalEntityMapper.toExternalEntity().
Changes:
Export defaultSwimlaneId and reuseSwimlaneId using Optional.ofNullable() pattern