Describe the bug

When importing some massive OpenAPI specifications (e.g. https://tripletex.no/v2/openapi.json), circular dependencies can lead to an out of memory error dur to the amount of times the same schema is parsed

See #1990

Steps to Reproduce

Try to import this schema https://tripletex.no/v2/openapi.json in the app or even better using the CLI: mockoon-cli import --input openapi.json --output output.json

Mockoon version:

=9.4.0

OS / OS version:

All