Generic codec class

[polybassa]

This introduces common classes for shared code between codecs like CBOR and ASN.1

[codecov]

Codecov Report

❌ Patch coverage is 89.87342% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.28%. Comparing base (30c07a1) to head (ffb00ae).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/libs/codec.py	88.79%	13 Missing ⚠️
scapy/asn1/ber.py	88.88%	1 Missing ⚠️
scapy/asn1fields.py	93.33%	1 Missing ⚠️
scapy/cbor/cborcodec.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5006      +/-   ##
==========================================
- Coverage   80.29%   80.28%   -0.01%     
==========================================
  Files         383      384       +1     
  Lines       95163    95208      +45     
==========================================
+ Hits        76407    76440      +33     
- Misses      18756    18768      +12     

Files with missing lines	Coverage Δ
scapy/asn1packet.py	90.00% <100.00%> (ø)
scapy/cbor/cborfields.py	77.90% <100.00%> (+0.05%)	⬆️
scapy/asn1/ber.py	82.93% <88.88%> (+0.21%)	⬆️
scapy/asn1fields.py	81.94% <93.33%> (-1.70%)	⬇️
scapy/cbor/cborcodec.py	88.31% <88.88%> (+0.54%)	⬆️
scapy/libs/codec.py	88.79% <88.79%> (ø)

... and 10 files with indirect coverage changes

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