Make Tests Great Again - Githubissues

This PR:

Makes all tests pass
Makes all tests consistent and deterministic
Simplifies all tests significantly and makes them more readable/understandable
Builds solid api stub and mock objects tools
Fixes a production bug where config was not reset between consecutive clarity restarts
Adds few extra tests
Changes webpack index.ts build to production without sourcemaps (this is unrelated to tests, but slipping in this small fix)

microsoft / clarity-js