Table: Add scrollbar to table widget

[lcmgh]

Problem

I noticed the table widget is already scrollable via keyboard navigation: https://github.com/tui-rs-revival/ratatui/blob/main/examples/table.rs

But it is lacking of a scrollbar.

Relates to #146

Solution

Add a config scrollbar: bool option or something similar that integrates a scrollbar to visualize the current position.

[joshka]

Perhaps @gibbz00 has some input on this? They mentioned that they were experimenting with Viewport scrolling a little while ago in #96 (comment). It might be related a little.

I wonder whether the entire concept of scrolling shouldn't be pulled out of widgets themselves and into something a little higher level (in a similar fashion to how block acts?). I'm not sure how that would look though.

[gibbz00]

Close this now that #228 has landed?

[joshka]

I think I'd still like to consider adding scrollbars to the widget as part of the config - e.g. what if table looks something like:

Table::new(rows).scrollbar(Scrollbar::new()...))

Instead of having to manually lay this out? I'm not sure what the right way to do this is, so would definitely want someone to investigate this first.