Unidirectional connect without automatic error to disconnect transform

[FZambia]

Now .Connect method automatically transforms any error to client protocol disconnect code. Sometimes though we want to postpone error processing, for example if we want to return some special status code in HTTP-based unidirectional transports. This PR adds .ConnectNoErrorToDisconnect method to let the caller process the error itself.

[codecov]

Codecov Report

Attention: Patch coverage is 95.34884% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.14%. Comparing base (612c8bd) to head (c0d987e).

Files with missing lines	Patch %	Lines
client.go	95.12%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #418      +/-   ##
==========================================
+ Coverage   81.52%   82.14%   +0.62%     
==========================================
  Files          40       39       -1     
  Lines        7215     8560    +1345     
==========================================
+ Hits         5882     7032    +1150     
- Misses        952     1146     +194     
- Partials      381      382       +1     

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