* Add Index Management README and quick testing steps for data streams.
* Surface data stream health in Data Streams tab (table and detail panel).
- Extract out DataHealth component for use in both Data Streams and Indices tabs.
- Refactor detail panel to use data structure & algo to build component.
- Refactor detail panel to use i18n.translate instead of FormattedMessage.
* Render index template name and index lifecycle policy name in the detail panel.
* Render storage size and max timestamp information in table and detail panel.
- Add 'Include stats' switch.
- Add humanizeTimeStamp service, localized to data streams.
