feat(cleanup): add after each cleanup helper

[bcarroll22]

What:

Add a cleanup helper that can be run after each tests

Why:

I want to be able to unmount components after tests. We don't need to clean up the DOM, but it should allow for things like clearing timeouts and intervals on unmount. Also I can't explain why, but this made the tests run about 1 second faster on my MacBook.

How:

Cleanup exported on the main API, also via a helper that can be used in a setup file if wanted.

Checklist:

• Documentation added to the docs site
• Typescript definitions updated
• Tests
• Ready to be merged

[codecov-io]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #19   +/-   ##
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  Coverage     100%   100%           
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  Files          20     20           
  Lines         262    262           
  Branches       65     65           
=====================================
  Hits          262    262

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[bcarroll22]

This also renames the asFragment property returned from render() to asJSON which is a more honest name for what it does. We don't return a DocumentFragment, we return a JSON representation of the tree which can be used for snapshots.

This won't be a breaking change because asFragment was undocumented. Docs are now added to the 3.0.0 site for asJSON.

[TAGraves]

This looks good - just one question. Don't we need to make a change to the typedefs for the asFragment -> asJSON change?

[bcarroll22]

🎉 This PR is included in version 3.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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