Add exports and keywords fields

[stramel]

Summary:

• Adds keywords field to package.json as recommended
  • https://docs.skypack.dev/package-authors/package-checks#keywords
• Adds exports field to package.json as recommended
  • https://docs.skypack.dev/package-authors/package-checks#export-map
  • https://nodejs.org/api/packages.html#packages_subpath_exports
• Adds sideEffect: false to package.json to enable tree-shaking in Webpack
  • https://webpack.js.org/guides/tree-shaking/
• Adds ./package.json export to export map for React Native
  • React Native / Metro bundler shows warning and ignores package due to change in rules about package.json's exports section react-hook-form/react-hook-form#3257
• Adds module key to package.json for ESM support
• Fixed the example folders to work
• Swapped typings to types (types appears to be more commonly used)

[codecov-io]

Codecov Report

Merging #32 (023eccc) into master (b1d93b3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   97.37%   97.37%           
=======================================
  Files           4        4           
  Lines         229      229           
  Branches       55       55           
=======================================
  Hits          223      223           
  Misses          6        6           

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[Buuntu]

Maybe we should break each of these commits into their own PRs? I will have an easier time reviewing them that way, let me know if that's too much work though.

[stramel]

I will break these into separate PRs!