* feat(external-apis): add LIST_MODULES, EXPORT_MODULE, IMPORT_MODULE feature keys, DTOs, and ability grants
* feat(external-apis): add CE stub modules controller and register in module
* feat(external-apis): add end-to-end tests for ExternalApisModulesController
* refactor(external-apis): simplify exportModule method signature in ExternalApisModulesController
* feat(external-apis): enhance tests for ExternalApisModulesController with additional cases for non-existent UUIDs
* feat(external-apis): update exportModule method to include exportTjdb parameter and enhance tests for its functionality
* feat(external-apis): enhance tooljet_database import schema validation and add module import/export helpers
* feat(external-apis): add tests for ExternalApisModulesController in starter and CE plans with appropriate status checks
* feat(external-apis): add tests for module and app import endpoints to validate JSON rejection
