Expand and collapse dataframe cells

[hannahblair]

Description

Add expand and collapse on double click of long cell values. (Should be make it single click?)

Also, you'd notice the width awkwardness that's there already but that will be fixed in a separate PR.

Closes: #2667

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Expand and collapse dataframe cells

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[abidlabs]

Very nice @hannahblair! The experience is quite nice. Just a few minor points:

• I would set a max_chars parameter in gr.DataFrame instead of hardcoding to 20. And by default, I would leave it as None to mean no truncation
• I think single-select is better than double-select (also for consisntency as when the gr.DataFrame is interactive, a single select makes it editable which expands the content)

[hannahblair]

thanks @abidlabs - those comments have been addressed now!

[abidlabs]

Works great in my tests @hannahblair! The only issue I notice is that of column widths (the first column is much larger than the others), which can be handled separately