NIST: Fetch statistical weight (g) from NIST ASD

[mimurrayy]

This PR makes the NIST module fetch the optional parameter g, which is currently not done.
The current NIST tests only check certain parts of the response table and should not be affected by the additional parameter.

Related issue: #2953

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.80%. Comparing base (1c6b7bf) to head (05192b1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2955   +/-   ##
=======================================
  Coverage   66.80%   66.80%           
=======================================
  Files         237      237           
  Lines       18320    18321    +1     
=======================================
+ Hits        12238    12239    +1     
  Misses       6082     6082           

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[bsipocz]

The result table in the doc has changed with this PR, so I'll push a commit to fix it and then go ahead with the merge.

Thanks @mimurrayy!

[mimurrayy]

Ah! I was just trying to figure out why the docs were failing. Thanks @bsipocz !

[keflavich]

Assuming we have tests in place that are passing (I hope we do...), this lgtm.

[bsipocz]

RTD failure is unrelated (and I'm not exactly sure why it started to show now), so I go ahead and merge this.

(the remote/server reaching tests are turned off by default, you can run them with e.g. pytest -P nist -R)

Thanks again!