Project: datamanagement
Issue DM-2254: Add SFM plugin for ngmix MCMC sampling
Add an SFM plugin for ngmix MCMC fitting, as in the example in the ngmix README. This should depend on DM-5429 (or a suitably configured modelft_ShapeletPsfApprox) for PSF approximation. For now, we should just take the mean of all parameters in the MCMC samples and write those to the record, as we currently don't have any way to save all of the samples. Testing and tuning this algorithm to get it working well should be deferred to another issue. The only requirement here is that it be able to run without crashing (even if that means setting the number of samples small).
Story points: 10