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 80.30%. Comparing base (fda6032) to head (7875b2f).

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   80.30%   80.30%           
=======================================
  Files         386      387    +1     
  Lines       96127    96163   +36     
=======================================
+ Hits        77191    77220   +29     
- Misses      18936    18943    +7     

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 4 files with indirect coverage changes

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[gpotter2]

I think there are too much comments in this PR

[polybassa]

Removed comments