Fixes including - Don't include Content-Length in request

[adam-fowler]

Also fixed the passing on of the sniHostname when no TLSConfiguration is passed in

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 56.01%. Comparing base (964ae17) to head (6101395).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/WSClient/WebSocketClient.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   55.50%   56.01%   +0.50%     
==========================================
  Files          22       22              
  Lines        1852     1855       +3     
==========================================
+ Hits         1028     1039      +11     
+ Misses        824      816       -8     

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