Big Bang Bot: Update CODEOWNERS

Action	User	Reason
Add	@cschaefer	user is in the team charter for this repo but not in the current repo's CODEOWNERS
Add	@daniel.stocum	user is in the team charter for this repo but not in the current repo's CODEOWNERS
Remove	@ron.beavers	user is not defined in the team charter for this repository
Remove	@seagren.tim	user is not defined in the team charter for this repository

These changes are automatically generated based on the state stored in the Team Charter Mission Team manifest. If these changes are not expected, please refer to the Updating Team Charter manifest docs.