Trapping dependencies Exceptions into TransportConnectionFailed

[leszekhanusz]

Breaking Change

This PR modifies the transports to trap exceptions when trying to use the underlying dependency post method.

Before, if an SSL error was received, you would get:

• SSLError with requests
• ClientConnectorCertificateError with aiohttp
• ConnectError with httpx

Now, in all cases your will receive a TransportConnectionFailed Exception with the same message as before.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7fb869a) to head (96b4f03).
Report is 21 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##            master      #558    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           38        40     +2     
  Lines         2908      3116   +208     
==========================================
+ Hits          2908      3116   +208     

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