Schema: Parsing HEALPix Maps

[Vidushi-GitHub]

@israelmcmc and @lpsinger
As per earlier discussions, we are in the process of preparing instructions on how to parse the HEALPix maps. Please feel free to add basic content for the notice producers.
Thanks!

This PR is in continuation of #950

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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+ Coverage   5.37%   5.63%   +0.25%     
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  Files        118      99      -19     
  Lines       2733    2414     -319     
  Branches     285     295      +10     
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- Hits         147     136      -11     
+ Misses      2584    2276     -308     
  Partials       2       2              

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[israelmcmc]

Thanks @Vidushi-GitHub. I have it my todo list, I'll make some time to work on this.

[Vidushi-GitHub]

@israelmcmc a gentle reminder. It would be helpful if you share the document, I can attempt to write.
@jracusin please list out the all possible libraries for reference, I can add it.

[jracusin]

@israelmcmc a gentle reminder. It would be helpful if you share the document, I can attempt to write. @jracusin please list out the all possible libraries for reference, I can add it.

mhealpy
astropy healpix

[lpsinger]

There is also this documentation which is a good source: https://emfollow.docs.ligo.org/userguide/tutorial/multiorder_skymaps.html

[Vidushi-GitHub]

Work in progress in PR #2498