BLE: Add Enhanced_Connection_Complete HCI event

[sacca97]

Related to #2581.
Should be no big deal. I did not add tests for it but I'm actively using it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.71%. Comparing base (a9eed2d) to head (ad39ce8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4576      +/-   ##
==========================================
- Coverage   81.58%   78.71%   -2.88%     
==========================================
  Files         340      333       -7     
  Lines       85351    80427    -4924     
==========================================
- Hits        69631    63305    -6326     
- Misses      15720    17122    +1402     

Files with missing lines	Coverage Δ
scapy/layers/bluetooth.py	90.05% <100.00%> (+0.03%)	⬆️

... and 75 files with indirect coverage changes

[guedou]

Thanks for the PR. Could you add a dissection unit test? We will ensure that the binding works correctly.