[MAINTENANCE] Update core-team in `teams.yml` (#5489)
[MAINTENANCE] Update core-team in `teams.yml` (#5489)

* feat: add Bill!

* chore: update teams

Co-authored-by: William Shin <37d41699bdee4fcb969ca499eb0f8b82c60d59cc@superconductive.com>
great-expectations/great_expectations,great-expectations/great_expectations,great-expectations/great_expectations,great-expectations/great_expectations