fix: Add missing peer dependencies to addon-knobs

[eps1lon]

Fixes Uncaught TypeError: Object(...) is not a function when using @storybook/addon-knobs and @emotion/core@^10.x

Issue:

• moment and emotion requirement undocumented for addon-knobs #3999

The combination of the above packages created the following dependency tree:

├─ @emotion/[email protected]
├─ @storybook/[email protected]
│  └─ @emotion/[email protected]

However @emotion/styled has a peer dependency to @emotion/[email protected]. I didn't find any method in npm or yarn to add @emotion/[email protected] while still being able to use @emotion/[email protected]. This is probably the reason missing peer dependencies should be added immediately instead of relying on consuming packages to do this.

What I did

• Add @emotion/[email protected] to dependencies of @storybook/addon-knobs.

How to test

• Is this testable with Jest or Chromatic screenshots?
  No
• Does this need a new example in the kitchen sink apps?
  No
• Does this need an update to the documentation?
  No

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

[wuweiweiwu]

LGTM!

[codecov]

Codecov Report

Merging #4928 into next will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #4928   +/-   ##
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  Coverage   35.02%   35.02%           
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  Files         566      566           
  Lines        7004     7004           
  Branches      937      937           
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  Hits         2453     2453           
  Misses       4055     4055           
  Partials      496      496

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