[REQ] export all models in a single file

[Mr-Jami]

Is your feature request related to a problem? Please describe.

Whenever bigger changes happen and we update the client (generator: typescript-angular) a lot of model files get updated. It becomes very messy reviewing a PR in github, if you get over 50 models which got changed slightly.

Describe the solution you'd like

I would like to be able to generate all interfaces/types in a single TS file

Describe alternatives you've considered

I have written a script which basically copies all the interfaces and paste it into a single file and then gets rid of the single files.