Feature request: Add Diagrams

[hason]

https://diagrams.mingrammer.com/

[vainikkaj]

This would be awesome 😃

[ggrossetie]

It looks great but it means executing untrusted Python code 😨

I did some research on how to run untrusted code safely while making sure that the response times are acceptable but I need to spend some time to experiment.

We can also provide such library as an optional "unsafe" container that won't be available on the public instance but users will be able to install it locally (at their own risk).

[shah]

@Mogztter we're looking forward to hearing more about this capability and whether integration with Kroki is possible. Thanks for the great work on Kroki!