#2081 fix hmr in react-native template

[danielduan]

Issue:

#2081 react-native hot module reload does not support stateless functional components

What I did

Converted root component to a Class

How to test

Is this testable with jest or storyshots?

Does this need a new example in the kitchen sink apps?

Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[codecov]

Codecov Report

Merging #2194 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2194   +/-   ##
=======================================
  Coverage   21.42%   21.42%           
=======================================
  Files         263      263           
  Lines        5805     5805           
  Branches      686      694    +8     
=======================================
  Hits         1244     1244           
+ Misses       4048     4025   -23     
- Partials      513      536   +23

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/down_panel.js	23.52% <0%> (ø)	⬆️
...s/left_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	28.04% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/left_panel.js	25.71% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/routes.js	0% <0%> (ø)	⬆️
... and 21 more

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