add pie wedge segmented aperture

[mperrin]

• Adds a WedgeSegmentedCircularAperture class, for defining pie-wedge or keystone-shaped apertures; some of the aperture geometries under consideration for HWO need this kind of aperture.
• Also, minor enhancement to radial_profile function adding a custom_function parameter, which lets you compute an arbitrary function evaluated in over each radial bin, for instance the min or max at a given radius. This generalizes the prior approach used for computing std dev or median absolute deviation in each bin. \
• Tests for both the above are included.

Example:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9fa90e1) 74.13% compared to head (21f916a) 74.30%. Report is 2 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #604 +/- ## =========================================== + Coverage 74.13% 74.30% +0.16% =========================================== Files 18 18 Lines 6558 6600 +42 =========================================== + Hits 4862 4904 +42 Misses 1696 1696 ```

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