Add state addon to the addons page

[Sambego]

Added

• An addon to manage state inside a story and update components when this state changes.

[codecov]

Codecov Report

Merging #2012 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2012   +/-   ##
=======================================
  Coverage   21.34%   21.34%           
=======================================
  Files         262      262           
  Lines        5767     5767           
  Branches      695      687    -8     
=======================================
  Hits         1231     1231           
- Misses       4005     4008    +3     
+ Partials      531      528    -3

Impacted Files	Coverage Δ
lib/codemod/src/transforms/update-addon-info.js	51.16% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
addons/info/src/components/Node.js	39.7% <0%> (ø)	⬆️
addons/knobs/src/KnobManager.js	32% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	41.41% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/init_panels.js	25% <0%> (ø)	⬆️
... and 24 more

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[danielduan]

looks good!