Add events addon

[ndelangen]

What I did

I added the events addon create by @z4o4z to this repository.
original repository here: https://github.com/z4o4z/storybook-addon-events

How to test

• run the cra-storybook example

[codecov]

Codecov Report

Merging #1130 into master will decrease coverage by 0.38%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1130      +/-   ##
==========================================
- Coverage   12.85%   12.47%   -0.39%     
==========================================
  Files         199      209      +10     
  Lines        4503     4641     +138     
  Branches      715      731      +16     
==========================================
  Hits          579      579              
- Misses       3291     3413     +122     
- Partials      633      649      +16

Impacted Files	Coverage Δ
addons/events/src/preview.js	0% <0%> (ø)
addons/events/src/index.js	0% <0%> (ø)
addons/events/register.js	0% <0%> (ø)
addons/events/stories/components/Logger.js	0% <0%> (ø)
addons/events/src/components/Event.js	0% <0%> (ø)
addons/events/stories/index.js	0% <0%> (ø)
addons/events/stories/constants.js	0% <0%> (ø)
addons/events/src/constants.js	0% <0%> (ø)
addons/events/src/manager.js	0% <0%> (ø)
addons/events/src/components/Panel.js	0% <0%> (ø)
... and 10 more

---

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[ndelangen]

@z4o4z care to review?

[z4o4z]

I'll fix it ASAP

[codecov]

Codecov Report

Merging #1130 into master will decrease coverage by 0.35%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1130      +/-   ##
==========================================
- Coverage   14.07%   13.71%   -0.36%     
==========================================
  Files         200      207       +7     
  Lines        4497     4615     +118     
  Branches      506      634     +128     
==========================================
  Hits          633      633              
+ Misses       3436     3432       -4     
- Partials      428      550     +122

Impacted Files	Coverage Δ
addons/events/src/manager.js	0% <0%> (ø)
addons/events/src/components/Event.js	0% <0%> (ø)
addons/events/src/components/Panel.js	0% <0%> (ø)
addons/events/register.js	0% <0%> (ø)
addons/events/src/preview.js	0% <0%> (ø)
addons/events/src/constants.js	0% <0%> (ø)
addons/events/src/index.js	0% <0%> (ø)
addons/knobs/src/KnobManager.js	38.57% <0%> (ø)	⬆️
.../src/manager/containers/CommentsPanel/dataStore.js	34.78% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
... and 45 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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