Type annotation bugfixes

[marci07iq]

This PR fixes two bugs in the type annotations:

1. Fix types in the constructor of various Enum fields. Enum fields accept a variety of specific formats to describe the Enum name - value mapping. The type annotations now list all the accepted types. The list is taken from the base class _EnumField line 2521

2. Fix the annotation of next_cls_cb in the PacketListField constructor. The comment on line 1700 shows the annotation correctly, but it was not correct in the actual function argument list.

No actual code was changes, only type annotations.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.15%. Comparing base (a4f958b) to head (eaa549e).
Report is 31 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4740      +/-   ##
==========================================
+ Coverage   82.13%   82.15%   +0.01%     
==========================================
  Files         361      361              
  Lines       86830    87284     +454     
==========================================
+ Hits        71319    71707     +388     
- Misses      15511    15577      +66     

Files with missing lines	Coverage Δ
scapy/arch/linux/rtnetlink.py	91.81% <ø> (ø)
scapy/fields.py	92.88% <100.00%> (+0.01%)	⬆️

... and 42 files with indirect coverage changes

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[gpotter2]

Thanks for the PR !