Allow setting memory limits from SDK

[Wumpf]

We have --memory-limit option, but there is no easy way to use it when you're inside Python or Rust.
We need to add this to both APIs and do a way better job documenting this feature!

[Wumpf]

Missing documentation is tracked by

• #1138

[emilk]

Maybe we should set this in the UI instead, persisting the settings on disc.

Default-on, add it in the ui