Explore: Adds Live option for supported datasources (#17062)

* Wip: Initial commit

* Refactor: Adds support in Loki datasource for streaming

* Refactor: Adds Live option to RefreshInterval

* Refactor: Adds styles to logrows

* Style: Reverses the order of Explore layout on Live

* Refactor: Adds LiveLogs component

* Tests: Adds tests for epics

* Style: Adds animation to Live in RefreshPicker

* Refactor: Adds ElapsedTime and progress line to LiveLogs

* Style: Adds specific colors to each theme

* Refactor: Adds support for Lokis new API

* Fix: Adds null to resulting empty array

* Refactor: Limits the rate of incoming messages from websockets

* Refactor: Throttles messages instead for simplicity

* Refactor: Optimizes row processing performance

* Refactor: Adds stop live button

* Fix: Fixes so that RefreshPicker shows the correct value when called programmatically

* Refactor: Merges with master and removes a console.log

* Refactor: Sorts rows in correct order and fixes minor UI issues

* Refactor: Adds minor improvments to sorting and container size

package.json

@@ -229,6 +229,7 @@
     "react-window": "1.7.1",
     "redux": "4.0.1",
     "redux-logger": "3.0.6",
+    "redux-observable": "1.1.0",
     "redux-thunk": "2.3.0",
     "remarkable": "1.7.1",
     "reselect": "4.0.0",