Permanent search bar

Summary: Out of the box the library search has some issues. when search matches it steals focus from the input. Eventually we want to customise the rendering of the tree items anyway so this lays the foundation for taht

Reviewed By: antonk52

Differential Revision: D41336524

fbshipit-source-id: 194f67023edd0675cd9bd8d6134260439c6b2785

desktop/flipper-plugin/src/__tests__/api.node.tsx

@@ -39,6 +39,8 @@ test('Correct top level API exposed', () => {
       "Dialog",
       "ElementsInspector",
       "FileSelector",
+      "HighlightContext",
+      "HighlightProvider",
       "Layout",
       "MarkerTimeline",
       "MasterDetail",
@@ -67,6 +69,7 @@ test('Correct top level API exposed', () => {
       "textContent",
       "theme",
       "timeout",
+      "useHighlighter",
       "useLocalStorageState",
       "useLogger",
       "useMemoize",