Config parameter to add suffix to contract types

[naaeef]

Is your feature request related to a problem? Please describe.
To match our existing coding conventions and to increase code readability, it would be great to have a config parameter that allows to set a suffix to the generated contract types (like Dto --> PetDto).

Additional context
Thank you for your help.

[christianhelle]

@naaeef thanks for taking the time to suggest this

Let me think about this one. It's not exactly hard to implement but I like that the generated types are as defined in the OpenAPI document

[christianhelle]

@all-contributors please add @naaeef for ideas

[allcontributors]

@christianhelle

I've put up a pull request to add @naaeef! 🎉