Legend: Sort by name

[adela-almasan]

Added the ability to sort legend by name.
Removed viz sorting from Barchart as this functionality was already removed from time series (as discussed with @leeoniya).
Updated docs.

legend.sort.by.name.mov

Fixes #18186

Special notes for your reviewer:

• added the "Name" header just to the sortable legends [Timeseries, Bar chart, Histogram]

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[leeoniya]

In table bottom - the legend stretches and the column name is displayed too far away from the actual value

any reason we can't always left-align the first header cell the same way the names are left-aligned? 🤔

[adela-almasan]

I don't think there's any. To me it doesn't make sense to be that stretched out..

[leeoniya]

LGTM, works for me :)

thanks!

[imatwawana]

LGTM!