Toggle all params and all metrics on ManageColumnsPopover

[jescalada]

PR for G-Research/fasttrackml#76.

Note that there was an issue with the Hide All button which wasn't working correctly with lots (5000+) of metrics, and also there were some pretty terrible performance issue when pressing any of the triggers.

This PR aims to fix the Hide All logic, as well as patching some of the performance issues (reduces wait times from around 60 seconds down to 2-3 seconds when pressing any trigger, at the cost of not being able to view/search columns correctly when there are 100+ columns). Users are expected to use the Toggle buttons or automatically hiding unselected metrics/params to begin with.

Changelog

• Fix Hide All logic (wasn't filtering custom metrics)
• Add virtualization for middle column to fix performance issues
  • Only active when there are >100 columns in the list
  • BUG: Virtualization doesn't let you view all the columns
  • BUG: (CSS issue) Dragging items makes the item visually disappear (it shifts from view becoming invisible, but the logic works as intended)
• Add toggles for Metrics and Params
  • Show/Hide All Params
  • Show/Hide All Metrics

[suprjinx]

Looks good