DM-37053: Add AMx/AFx/ADx astrometry metrics

[cmsaunders]

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[cmsaunders]

I want to point out that the first two commits for this PR result in AMx, ADx, and AFx metrics consistent with the current implementation in faro. The third commit modifies ADx and AFx as discussed on the Jira ticket. After the review is done on this PR, I will squash the commits.

[jeffcarlin]

Looks great, Clare! A few minor comments, but overall the ticket looks good to merge.

See the inline comment re: selecting on mags between 17-21.5 -- seems unnecessary since we're already doing a S/N selection?

I had a slight concern that the default +/-1 arcmin annulus width might be too large. But it's probably fine, and it's configurable so can be changed if desired.

In a test run I did on RC2, some of the plots (histograms) didn't look great. The existence of large outliers made the auto-scaling select a large binsize and too-broad x-axis range. Not specific to this ticket, but something to consider for histograms in analysis_tools generally?

[cmsaunders]

Thanks for the review, @jeffcarlin! I tried to stick as close as possible to what is currently done in faro, so that is why there are both S/N and magnitude cuts. The annulus width also is the same as in faro. We can think about changing them, but for the time being, I want to make this as close as possible to what is done in faro for continuity.

For the histogram appearance, I will add that to DM-39163, because I think it will be easiest to do all the plotting changes together.