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Support additional cylindrical (aka equiangular) sampling schemes #251

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@Magwos

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@Magwos

In CMB data analysis (aiming at probing small angular scales), an interest has been growing towards cylindrical griding, named CAR in https://phy-act1.princeton.edu/public/saiola/act_dr4_C20.pdf or ECP in https://www.aanda.org/articles/aa/full_html/2013/08/aa21575-13/aa21575-13.html. It corresponds to a rectangular projection, equi-spaced in latitude, and not equal-area projection, but with the same number of pixels per ring, and relies on Clenshaw-Curtis quadrature weightings for the associated transforms.

This sampling scheme is the baseline one used for the ACT (Atacama Cosmology Telescope) collaboration and central in many tools developed for the LAT analysis in the Simons Observatory collaboration (in which I am part of).

I wanted to ask if it would be possible to have s2fft support for such sampling scheme.

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