Sticky header column in table view

[jeffbaumes]

@sgratzl could you comment on how messy this would be? I think it would be a nice addition to the UI.

[sgratzl]

technological background

• the table is rendered in column order: so each visible column (determined by the scroller library) is absolutely positioned and shows all rows.
• except the row header column (1, 2, 3, 4, ..) which is rendered before the scroll content, So, like a static column and then next to it all the dynamically absolutely positioned columns.
• since vertically all rows are rendered all the time, one can use the CSS position: sticky; top: 0 to do the trick
• for a row it would mean to either adapt/change the library to allow sticky columns or detect when the id column is not rendered anymore and "jump"/"move" it out of the dynamic scroll area next to the static row number column.

So, quite challenging. Moreover, the Imputation tab: https://github.com/girder/viime/pull/304 already has a pretty clean view on the Metabolites table which doesn't have the 1,2,3 and A,B,C,D anymore but just the defined headers.

[jeffbaumes]

Ok, I'm convinced this should continue to not be a to do item for now.