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/Layout.tsx

@@ -203,11 +203,11 @@ const SandySplitContainer = styled.div<{
   alignItems: props.center ? 'center' : 'stretch',
   gap: normalizeSpace(props.gap, theme.space.small),
   overflow: props.center ? undefined : 'hidden', // only use overflow hidden in container mode, to avoid weird resizing issues
-  '> :nth-child(1)': {
+  '>:nth-of-type(1)': {
     flex: props.grow === 1 ? splitGrowStyle : splitFixedStyle,
     minWidth: props.grow === 1 ? 0 : undefined,
   },
-  '> :nth-child(2)': {
+  '>:nth-of-type(2)': {
     flex: props.grow === 2 ? splitGrowStyle : splitFixedStyle,
     minWidth: props.grow === 2 ? 0 : undefined,
   },