Inject soap client factory instead of an instance of SoapClient

[loevgaard]

This PR is a BC break.

Instead of injecting an instance of SoapClient into the Client we inject the SoapClientFactoryInterface. This has the advantage that the SoapClient doesn't have to be instantiated in order to instantiate the Client.

[codecov]

Codecov Report

Base: 76.63% // Head: 77.36% // Increases project coverage by +0.73% 🎉

Coverage data is based on head (f15ac9c) compared to base (ab0346e).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head f15ac9c differs from pull request most recent head 15bc3a7. Consider uploading reports for the commit 15bc3a7 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #12      +/-   ##
============================================
+ Coverage     76.63%   77.36%   +0.73%     
- Complexity       77       79       +2     
============================================
  Files            10       10              
  Lines           184      190       +6     
============================================
+ Hits            141      147       +6     
  Misses           43       43              

Impacted Files	Coverage Δ
src/Client/Client.php	58.13% <100.00%> (+3.13%)	⬆️
src/Factory/SoapClientFactory.php	100.00% <100.00%> (ø)

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