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 88.89590% with 176 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.46%. Comparing base (2498fbb) to head (16e4d80).

Files with missing lines	Patch %	Lines
scapy/asn1/uper.py	89.15%	78 Missing ⚠️
scapy/asn1/oer.py	87.73%	53 Missing ⚠️
scapy/asn1fields.py	89.48%	45 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5031      +/-   ##
==========================================
+ Coverage   80.22%   80.46%   +0.23%     
==========================================
  Files         387      389       +2     
  Lines       96450    97971    +1521     
==========================================
+ Hits        77381    78835    +1454     
- Misses      19069    19136      +67     

Files with missing lines	Coverage Δ
scapy/all.py	100.00% <100.00%> (ø)
scapy/asn1/ber.py	96.62% <100.00%> (+13.90%)	⬆️
scapy/asn1fields.py	92.62% <89.48%> (+8.98%)	⬆️
scapy/asn1/oer.py	87.73% <87.73%> (ø)
scapy/asn1/uper.py	89.15% <89.15%> (ø)

... and 8 files with indirect coverage changes

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[gpotter2]

If possible, can we avoid this?

I'd rather have barcoded bytes strings as unit tests, but I don't think it's necessary to have a lib for that.

[polybassa]

Done. Sorry that this PR became so huge. I hope there is a way forward to get it merged.