[TLS13] Client key update & PSK

[gpotter2]

Requires #2585

• rebase of https://github.com/romain-perez/scapy/tree/add-tls13-psk
• includes key update & psk changes
• added tests for both
• refactored unit tests
• cleanup server CCS that ended up duplicated

[codecov]

Codecov Report

Merging #2586 into master will decrease coverage by 0.14%.
The diff coverage is 50.52%.

@@            Coverage Diff             @@
##           master    #2586      +/-   ##
==========================================
- Coverage   88.47%   88.33%   -0.15%     
==========================================
  Files         246      246              
  Lines       52003    52132     +129     
==========================================
+ Hits        46010    46049      +39     
- Misses       5993     6083      +90     

Impacted Files	Coverage Δ
scapy/layers/tls/record_tls13.py	83.33% <ø> (-2.93%)	⬇️
scapy/layers/tls/automaton_cli.py	79.43% <40.00%> (-3.25%)	⬇️
scapy/layers/tls/handshake.py	83.27% <43.66%> (-4.03%)	⬇️
scapy/layers/tls/automaton_srv.py	76.90% <65.95%> (-1.14%)	⬇️
scapy/layers/tls/automaton.py	85.36% <100.00%> (-0.59%)	⬇️
scapy/layers/tls/record.py	90.22% <100.00%> (-0.58%)	⬇️
scapy/layers/tls/session.py	78.40% <100.00%> (+0.16%)	⬆️
scapy/layers/tls/extensions.py	83.07% <0.00%> (+0.62%)	⬆️
... and 1 more

[gpotter2]

@guedou @p-l- This is ready for review.