Live: include a streaming event manager (#26537)

package.json

@@ -208,6 +208,7 @@
     "@types/md5": "^2.1.33",
     "@types/react-loadable": "5.5.2",
     "@types/react-virtualized-auto-sizer": "1.0.0",
+    "@types/sockjs-client": "^1.1.1",
     "@welldone-software/why-did-you-render": "4.0.6",
     "abortcontroller-polyfill": "1.4.0",
     "angular": "1.6.9",
@@ -219,6 +220,7 @@
     "baron": "3.0.3",
     "brace": "0.11.1",
     "calculate-size": "1.1.1",
+    "centrifuge": "^2.6.4",
     "classnames": "2.2.6",
     "clipboard": "2.0.4",
     "common-tags": "^1.8.0",
@@ -273,6 +275,7 @@
     "search-query-parser": "1.5.4",
     "slate": "0.47.8",
     "slate-plain-serializer": "0.7.10",
+    "sockjs-client": "^1.4.0",
     "tether": "1.4.7",
     "tether-drop": "https://github.com/torkelo/drop/tarball/master",
     "tinycolor2": "1.4.1",