docs: include PyArrow in Tutorial/DataFrame

[MarcoGorelli]

In https://narwhals-dev.github.io/narwhals/basics/dataframe/ we only show pandas + Polars. Let's get PyArrow in there too?

I'd suggest:

• for all except for "example 3", we could have tabs for: pandas, Polars[lazy], PyArrow
• for example 3, we could have: pandas, Polars[eager], PyArrow

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file to modify: https://github.com/narwhals-dev/narwhals/blob/main/docs/basics/dataframe.md

contributing guide: https://github.com/narwhals-dev/narwhals/blob/main/CONTRIBUTING.md

[mattcristal]

I would like to work on this one!