Improve BER handling of integer boundaries

[gpotter2]

• BER maximum numeric values should be capped at 2**32 when decoding BER_num_dec
• BER shouldn't allow infinite SEQUENCE nesting, let's limit it to.. uh.. 32

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.51%. Comparing base (5967449) to head (175733c).

Files with missing lines	Patch %	Lines
scapy/asn1/ber.py	78.57%	3 Missing ⚠️
scapy/asn1/asn1.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5063      +/-   ##
==========================================
+ Coverage   80.49%   80.51%   +0.01%     
==========================================
  Files         390      390              
  Lines       96758    96765       +7     
==========================================
+ Hits        77886    77908      +22     
+ Misses      18872    18857      -15     

Files with missing lines	Coverage Δ
scapy/cbor/cbor.py	83.62% <100.00%> (ø)
scapy/cbor/cborcodec.py	87.77% <100.00%> (ø)
scapy/asn1/asn1.py	86.63% <50.00%> (ø)
scapy/asn1/ber.py	86.11% <78.57%> (+3.39%)	⬆️

... and 6 files with indirect coverage changes

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