Slider for time filter

[thomoco]

Enhancement request for Kibana, originally mentioned by one of our partners. They would like to see a "time slider" option available for the Time Filter.

For example, rather than selecting from the Quick, Relative or Absolute, a slider would present a horizontal slider bar that would allow one to slide from a left-hand-side option of "All Time" to a right-hand-side option of "Last 15 minutes", and allow the user to drag the slider left or right to find the area of focus.

This is a relatively common method of viewing data, for example is commonly seen in tools for viewing stock prices, exchange rates over time, and other sets of data where the time focus may significantly alter the relative value of the data.

[timroes]

We are not planning to replace the current time picker by a pure slider version so far. But there are discussions about adding alternative time/date controls to input controls, which could be in different formats. I would close this and refer to #14177 instead for tracking implementation in input controls.