Let source.data accept DataFrame

[bryevdv]

This has come up a few times in support questions recently:

source.data = some_dataframe

It does not work, AFAIK, but also does not seem to error either. We should add a .accepts to make this work.

[bryevdv]

Well it does error:

ValueError: expected an element of ColumnData(String, Seq(Any)), got day time

But maybe people are missing it (the entire df gets printed and the exception is at the top)

[github-actions]

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