Implement deeplink, creating pastes, log deduplication

Summary:
This diff implements the remaining features in the logs plugin:

- deeplinking
- merging duplicate rows

The logs plugin source code has now been reduced from originally `935` to `285` LoC. All optimisation code has been removed from the plugin:

* debouncing data processing
* pre-rendering (and storing!) all rows

Finally applied some further styling tweaks and applied some renames to DataTable / DataSource + types finetuning. Some more will follow.
Fixed a emotion warning in unit tests which was pretty annoying.

Reviewed By: passy

Differential Revision: D26666190

fbshipit-source-id: e45e289b4422ebeb46cad927cfc0cfcc9566834f

desktop/flipper-plugin/src/ui/theme.tsx

@@ -8,7 +8,6 @@
  */
 
 // Exposes all the variables defined in themes/base.less:
-
 export const theme = {
   white: 'white', // use as counter color for primary
   black: 'black',
@@ -38,7 +37,12 @@ export const theme = {
     huge: 24,
   } as const,
   fontSize: {
-    smallBody: '12px',
+    default: '14px',
+    small: '12px',
+  } as const,
+  monospace: {
+    fontFamily: 'SF Mono,Monaco,Andale Mono,monospace',
+    fontSize: '12px',
   } as const,
 } as const;