Allow facility operator to reassign project creator to another user

[mjstealey]

Projects created for EDU purposes are often performed by a facility operator who has no stake in the project other than creating it on the behalf of the person requesting it. This can leave the facility operator with numerous {uuid}-pc roles cluttering their own account and exaggerating the size of the their cookie or token to unusable levels.

It is proposed that a facility operator be able to reassign the project creator role to the person who had requested the creation of the project, thus delegating future responsibility to that person.

• create new endpoint under \projects, slug TBD
• add {uuid}-pc COU to newly named project creator
• remove {uuid}-pc COU from initial creator
• return 204 on success, or appropriate error message on failure