KTOR-9095 Darwin: Set an actual HttpProtocolVersion

[osipxd]

Subsystem
ktor-client-darwin

Motivation
KTOR-9095 Darwin: HttpResponse.version always returns HTTP_1_1

Solution
Use URLSession:task:didFinishCollectingMetrics: to save transaction metrics and get protocol version from it later.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch osipxd/darwin-protocol

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[osipxd]

This is actually wrong. Events are called in the following order:
:didReceiveData → :didFinishCollectingMetrics → :didCompleteWithError

:didFinishCollectingMetrics is the place where we get the protocol version. So I thought we can complete response only from :didCompleteWithError. The problem is that this event is not called until we've completely read the body. And it is a problem for streaming responses. That's why testDownloadStreamResponseWithCancel hangs.

I'll try to find a different solution.