NIST Vectorizing

[nkphysics]

Is this what yall had in mind for #682 ?
I'm not too sure since I can't access the fb post.
Tried to explore what Vizier was doing.
Figured I'd try to start off small (why I chose NIST).
These changes allow for querying multiple linenames with one request i.e...

 >>> from astroquery.nist import Nist
 >>> import astropy.units as u
 >>> table = Nist.query(4000 * u.AA, 7000 * u.AA, linename=["H I", "Fe I", "V I"])

There might be more that could be done for NIST but linename was the main place I thought this could be applied.
Maybe could also be applied to energy_level_unit, idk though that might make the responses messy.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@770949e). Click here to learn what that means.
The diff coverage is 100.00%.

❗ Current head 6b96846 differs from pull request most recent head 0475354. Consider uploading reports for the commit 0475354 to get more accurate results

@@           Coverage Diff           @@
##             main    #2678   +/-   ##
=======================================
  Coverage        ?   65.74%           
=======================================
  Files           ?      233           
  Lines           ?    17842           
  Branches        ?        0           
=======================================
  Hits            ?    11731           
  Misses          ?     6111           
  Partials        ?        0           

Impacted Files	Coverage Δ
astroquery/nist/core.py	90.81% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[ceb8]

Looks good to me!

[nkphysics]

Looking at other PRs figured this might need a changelog entry, so I've gone ahead and added one just in case.

[bsipocz]

All looks good, thank you!

I've also reworded the docs around the multiple lines.

[bsipocz]

Thanks @nkphysics!