Added addon-knobs to crna and vanilla react native.

[Gongreg]

Issue: rn examples were missing addon knobs examples.

What I did

Added example taken from cra example.

How to test

Try it out.

[tmeasday]

I don't reckon the duplication is an issue!

Can you update the snapshot? Should be a matter of running npm test -- -u and checking in the snapshot changes.

[Gongreg]

@tmeasday, alright, I'll do it tomorrow. :)

[danielduan]

These look good to me. The duplication errors are there to help us find redundant code, but this should probably be duplicated.

[ndelangen]

I fixed a merge-conflict in the package.json

[codecov]

Codecov Report

Merging #1636 into release/3.3 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           release/3.3    #1636   +/-   ##
============================================
  Coverage        21.24%   21.24%           
============================================
  Files              252      252           
  Lines             5695     5695           
  Branches           683      687    +4     
============================================
  Hits              1210     1210           
+ Misses            3958     3938   -20     
- Partials           527      547   +20

Impacted Files	Coverage Δ
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
addons/knobs/src/components/types/Object.js	5.81% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
app/react/src/client/preview/element_check.js	41.17% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/hierarchy.js	48.8% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.86% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
addons/storyshots/src/require_context.js	0% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
... and 18 more

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[ndelangen]

TESTED