Output generation into one file instead of multiple files per folder

[silver-snoopy]

Describe the solution you'd like Dear @ferdikoomen, I really like the way how this open-api generator works and generates super nice types. 💯

I would like to ask you about the output configuration of this package. Would it be possible to generate the output of one execution into one file instead of a folder with many files (file per type)

This would mean that - user gives the output file and the models, client, schema and the services are generated into that one singular file.

Let me know what do you think about it.

Best regards, D