Refactors bundles exports, more consistent generation of bundles (v5) (#4475) ...

* Refactors bundles exports, more consistent generation of bundles

* Incorrect trailing comma

* Cleanup getting package JSON fields

* Alphabetized the list of imports and exports

Test and build system optimizations (v5) (#4460) ...

* Adds optimizations for test and build system

* Fixes cannot pass undefined to describe

* Support multiple build outputs

* Removes builder and tester internal packages

* Removes unnecessary package.json file

* Bumped buble version, sorts package.json deps

* Fixes dist command for deploying bundles