[ML] Add paging to Anomaly Explorer swimlane

[peteharverson]

The Anomaly Explorer swimlane uses a 'limit' control for selecting the number of influencer field values / job IDs that are shown. By default this is set to 10, with additional options for displaying 5, 25 or a maximum of 50 values. However currently there is no way of viewing more than the top 50 values (as sorted by anomaly score). There are also usability issues when using the higher limit values of 25 or 50, in that on selection in the swimlane the anomaly charts and table are usually only visible by scrolling down to the bottom of the view. The responsiveness of the view can also suffer when using a page size of 50, which would be made worse if for example an option of 100 was added to the limit dropdown.

The addition of paging controls, as used for example in table components in Kibana, would allow the user to view the full list of influencer field values. The vertical height of the swimlane can also be kept low by using a page size of 5 or 10, so that the anomaly charts and table are visible without excessive scrolling, whilst allowing the user to view the full list if swimlane values through paging.

[elasticmachine]

Pinging @elastic/ml-ui (:ml)