feat: _display_ protocol

[akshayka]

If an object implements _display_() -> Any, we render it using marimo's built-in renderer applied to obj._display_().

Example:

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[mscolnick]

Is this a documented protocol? Should we include it in our documentation and write a test

[akshayka]

May revisit later ...

[mscolnick]

I found a good reason for this. These are equivalent, so I don't think it is worth the syntactic sugar, but having _display_ could benefit libraries that don't/can't depend on marimo

def _display_():
  return obj

def _mime_():
  return ("text/html", mo.as_html(obj))

[mscolnick]

Docs?

[akshayka]

Yea needs docs and tests. Will finish this up later this week

[github-actions[bot]]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.9.21-dev8