Add nbns_request() util

[gpotter2]

This PR:

• adds a nbns_request to query Netbios names

[codecov]

Codecov Report

❌ Patch coverage is 21.95122% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.76%. Comparing base (c776b9f) to head (9c31f3e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/netbios.py	15.78%	32 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4853      +/-   ##
==========================================
- Coverage   80.88%   80.76%   -0.12%     
==========================================
  Files         368      368              
  Lines       90339    90378      +39     
==========================================
- Hits        73069    72994      -75     
- Misses      17270    17384     +114     

Files with missing lines	Coverage Δ
scapy/layers/dns.py	83.61% <ø> (ø)
scapy/route.py	91.85% <100.00%> (ø)
scapy/sendrecv.py	85.53% <100.00%> (-0.94%)	⬇️
scapy/layers/netbios.py	76.13% <15.78%> (-16.62%)	⬇️

... and 10 files with indirect coverage changes

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