MLIBZ-3027:Creating a method for changing Kinvey api version in the Client.Builder.

[eugeninnowise]

Description

Customers should have possibility to change Kinvey api version.

Changes

New method in the Builder class:
SetApiVersion()

New property in the Client class:
ApiVersion{get;}

Tests

TestSetApiVersionAuthRequests()
TestSetApiVersionKinveyClientRequests()

[codecov-io]

Codecov Report

Merging #228 into develop will increase coverage by 0.1%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           develop     #228     +/-   ##
==========================================
+ Coverage    80.36%   80.46%   +0.1%     
==========================================
  Files           87       87             
  Lines         5867     5883     +16     
==========================================
+ Hits          4715     4734     +19     
+ Misses        1152     1149      -3

Flag	Coverage Δ
#Linux	80.46% <100%> (+0.1%)	⬆️
#macOS	79.68% <100%> (+11.5%)	⬆️

Impacted Files	Coverage Δ
Kinvey.Core/Core/KinveyHeaders.cs	75% <100%> (-0.68%)	⬇️
Kinvey.Core/Client/Client.cs	84.44% <100%> (+0.59%)	⬆️
Kinvey.Core/Auth/KinveyAuthRequest.cs	82.16% <100%> (+0.59%)	⬆️
Kinvey.Core/Client/AbstractKinveyClient.cs	58.87% <100%> (+0.78%)	⬆️
Kinvey.Core/Core/AbstractKinveyClientRequest.cs	63.7% <100%> (+0.39%)	⬆️
Kinvey.Core/Client/AbstractClient.cs	86.13% <0%> (+2.97%)	⬆️

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[heyzooi]

@eugeninnowise maybe better to rebase before merge

[eugeninnowise]

@heyzooi I agree with you! It is done.