Add nameservers as metadata options

[TAlonglong]

• [X] Closes #34
• [X] Tests added
• [X] Tests passed: Passes pytest nwcsafpps_runner
• [X] Passes flake8 nwcsafpps_runner
• [ ] Fully documented

[codecov[bot]]

Codecov Report

Merging #36 (4ba1a10) into main (9a13adc) will increase coverage by 1.62%. The diff coverage is 98.55%.

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   53.94%   55.57%   +1.62%     
==========================================
  Files          14       14              
  Lines        1774     1848      +74     
  Branches      213      241      +28     
==========================================
+ Hits          957     1027      +70     
- Misses        799      803       +4     
  Partials       18       18              

Flag	Coverage Δ
unittests	55.57% <98.55%> (+1.62%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nwcsafpps_runner/pps_posttroll_hook.py	81.03% <90.90%> (+3.92%)	:arrow_up:
nwcsafpps_runner/tests/test_pps_hook.py	100.00% <100.00%> (ø)
nwcsafpps_runner/metno_update_nwp.py	0.00% <0.00%> (ø)

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