Add Django Rest Framework to available apps

[sveetch]

We lack of this application to easily add API for some application.

As an example, Lotus has an API but it is not enabled, adding DRF to available apps would ease to enable the Lotus API.

• This should be an optional feature to enable from cookiecutter prompt;
• It should not add too much opinionated options in DRF settings;
• We should see for the best choice of managing authentication in API request (Django session, token, etc..). Possibly we can not enable anything and let developer choose, DRF documentation seems to cover it properly;
• It should include a better API browser layout. At least we use the simple "drf-redesign" or we could have the time to configurate drf-spectacular/;

Lotus has covered many things on this subject and will be a great inspiration.