Cleanups, better build pipeline and publish as common js

[amoutonbrady]

This PR aims to:

• Cleanups the source by extracting types into their own files and cleaning up the code to make TS happy
• Make tsconfig.json observe the tests files for linting errors
• Make a tsconfig.build.json to build only the source file and exclude tests
• Compile the source to commonjs. Jest runs on node and doesn't understand import (as far as I tested on another project). I believe this is what's happening here: https://github.com/testing-library/preact-testing-library/blob/master/.babelrc#L7

[amoutonbrady]

Just checking in the tests seems to pass just fine, I think the 12k diff of the lockfile is due to the version. The initially commited one was probably made with npm < 7 whereas I made mine with npm > 7. If this is an issue I can quickly change my node version and regenerate a clean v1 lock file.

[ryansolid]

Thank you I was going to set up an example today as it was so late last night when I finished up the test suite. Completely missed on the CommonJS. Thanks.