Based on the API arrived at in DM-16925, file an RFC describing the plans for transitioning to PhotoCalib. In particular, this should describe changes that science users will have to make to their code to support this transition.

The story point count includes work to file the RFC, participate in discussion, and make minor changes to the plan based on the results. If significant further work is required before proceeding, that should be captured on other tickets.

The adopted RFC should trigger DM-10156.