Release script (#11223)

* First chunk of new release script

* Re-ordered build steps to combine error codes and releases

* Reorganized build files; added stub publish script

* First pass at publis script. Also collect and print dry-run commits/publish commands.

* Deleted old react-release-manager scripts

* Cleaned up release package.json

* Basic README instructions

* Removed unnecessary 'async' keyword from a method

* Wordsmithing

* Tweaked README

* Renamed build -> build-commands and publish -> publish-commands to avoid conflict with .gitignore

* Bump pre-release package versions differently

* Prettier

* Improved CircleCI API token setup instructions message

* Lint fix

* Typofix