Change SQL Lab results table horizontal scroll

[carlosms]

Proposal, originally suggested by @dpordomingo here:

Could we fit the displayed columns in the window avoiding the horizontal scroll?
It could be done shrinking wider columns (like blob_content) using max-width or similar, and ellipsing it's content.

As I said in the original thread:

I think this is risky, we'll improve the experience for some results, but it may be worse in other cases.
Also the more we deviate from upstream, the more debt we accumulate to be paid when we need to merge newer code later.

My preference would be to wait for a stronger need to make changes like this.

[smacker]

ellipsing its content

Working on demos I used sqllab and ability to see the full content of a cell was very useful. (like commit hashes, long names and so on). Please don't break it.

[dpordomingo]

Nice features:

• a toggle to ellipse and unellipse, being the ellipsed version the default, and remembering the last user action.
• being able to see the full content on hover.