feat: allow to override ssl servername

[bertho-zero]

Ideally, you would be able to choose the server name used for SSL verification.

Another way to fix #2588 and #3835

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.83%. Comparing base (234901d) to head (26eb4b5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3845   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files          86       86           
  Lines       13596    13596           
  Branches     1606     1606           
=======================================
  Hits        12214    12214           
  Misses       1382     1382           

Flag	Coverage Δ
compression-0	88.94% <100.00%> (ø)
compression-1	89.81% <100.00%> (ø)
static-parser-0	87.40% <100.00%> (ø)
static-parser-1	88.17% <100.00%> (ø)
tls-0	89.25% <0.00%> (ø)
tls-1	89.60% <100.00%> (ø)

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