style(typings): add new types

[layershifter]

Fixes #1289.

This PR:

• add new types for typings as described in RFC: New types for typings #1289;
• add new tests that check that all types are same as in propTypes.

[layershifter]

@levithomason we have following validator:

export const itemShorthand = (...args) => every([
  disallow(['children']),
  PropTypes.oneOfType([
    PropTypes.array,
    PropTypes.node,
    PropTypes.object,
  ]),
])(...args)

However, I don't remember any case when itemShorthand can be an array. Can you clarify?

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@2b906ed). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1782   +/-   ##
=========================================
  Coverage          ?   99.75%           
=========================================
  Files             ?      145           
  Lines             ?     2474           
  Branches          ?        0           
=========================================
  Hits              ?     2468           
  Misses            ?        6           
  Partials          ?        0

Impacted Files	Coverage Δ
src/collections/Message/MessageItem.js	100% <ø> (ø)
src/modules/Progress/Progress.js	100% <ø> (ø)
src/elements/List/ListItem.js	100% <ø> (ø)
src/collections/Message/MessageHeader.js	100% <ø> (ø)

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[layershifter]

@levithomason Ready for review, also please pay attention to the question above.

[levithomason]

However, I don't remember any case when itemShorthand can be an array. Can you clarify?

I went back and checked some old issues and discussions around this. I think we can remove the array type from itemShorthand now. Give it a go and see if you run into any test failures or documentation issues and we'll go from there.

[layershifter]

@levithomason you have already removed it in the Tab's PR 😄 So, we're ready for review there.

[levithomason]

Released in [email protected].