Redesign create pipeline UX and pipeline outputs for greater density and performance

[mwylde]

This PR redesigns the create pipeline experience with a focus on reducing the space taken up by UI elements to increase room for the editor and results pages. It looks like this:

Changes:

• Main sidebar is now collapsable
• The catalog is split into two tabs: tables and UDFs, and can now be resized and hidden
• Pipeline controls have been shrunk and moved into the top bar, allowing us to eliminate the mid-bar
• Tabs for the output pane have been shrunk and moved to the side
• New data table component with a much more compact style, resizable columns, and much better performance—allowing us to show up to 10k rows
• New control for configuring whether sinks are enabled in preview
• (in pipeline details) fixed issue where stopping and starting a pipeline would stop the tailing, without making that obvious to the user, requiring a refresh to restart tailing
• Output data API now sends batches instead of individual rows, and preview sink keeps track of row ids statefully