Add background-compatible `URLSessionClient` class#1163

Merged

designatednerd merged 12 commits intomasterfrom add/urlsessionclient

Apr 27, 2020

+612-131

Commits on Apr 21, 2020

Add URL session client and tests
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replace URLSession with URLSession client, add raw result callback and go to requiring http response
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make raw completion optional, better error handling
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fix annotations and make a couple methods subclassable
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replace MockURLSession with MockURLSessionClient subclass.
designatednerd
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update tests to use mock client instead of mock session, fix a couple things that don't need to be unwrapped anymore
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add inline documentation to URLSessionClient
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Update advanced setup docs to include some documentation for new URLSessionClient class.
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test two different types of cancellation
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add missing @available warnings for watchOS and tvOS
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Add note about delegate methods to the class documentation of URLSessionClient
designatednerd
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Commits on Apr 24, 2020

add context to error being returned when something goes wrong at the network level
designatednerd
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