Added ASN.1 UPER and OER encoding

[polybassa]

This encoders are a preparation to support V2X / C-ITS communication in Scapy.

[codecov]

Codecov Report

❌ Patch coverage is 84.68407% with 223 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.36%. Comparing base (fbd0956) to head (76256cd).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/asn1/uper.py	85.61%	99 Missing ⚠️
scapy/asn1/oer.py	83.10%	73 Missing ⚠️
scapy/asn1fields.py	84.49%	51 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5031      +/-   ##
==========================================
+ Coverage   80.34%   80.36%   +0.02%     
==========================================
  Files         386      388       +2     
  Lines       96034    97538    +1504     
==========================================
+ Hits        77154    78384    +1230     
- Misses      18880    19154     +274     

Files with missing lines	Coverage Δ
scapy/all.py	100.00% <100.00%> (ø)
scapy/asn1/ber.py	82.90% <100.00%> (+0.17%)	⬆️
scapy/asn1fields.py	84.62% <84.49%> (+0.98%)	⬆️
scapy/asn1/oer.py	83.10% <83.10%> (ø)
scapy/asn1/uper.py	85.61% <85.61%> (ø)

... and 13 files with indirect coverage changes

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