Andrew Babenko

Allow to pass custom spec -> definition for API entity

1

## Describe Request: I would like to pass custom definitions (like Kafka topics) to a catalog-info API entity definition but because of hardcoded [validator rule](https://github.com/RoadieHQ/roadie-backstage-plugins/blob/main/utils/roadie-backstage-entity-validator/src/validator.js#L43) it's impossible to do that...