Using Network.HTTP2.Server.

[kazu-yamamoto]

I have extracted HTTP/2 implementation in warp and moved it to Network.HTTP2.Server in http2. This results in so beautiful APIs and I feel it's promising. It is independent from WAI hoping that other HTTP engines can use it. http2 version 2.0.0 has been already released.

This PR deletes many modules relating to HTTP/2 and uses Network.HTTP2.Server. This implementation passes all tests on my local machine including h2spec. Field testing has been done at least two weeks in my web site.

@snoyberg This PR is to telling Warp guys that a big change is coming. Please give a look and tell me if you find something wrong.

[kazu-yamamoto]

hackage created its doc: http://hackage.haskell.org/package/http2-2.0.0/docs/Network-HTTP2-Server.html

[kazu-yamamoto]

Background: https://kazu-yamamoto.hatenablog.jp/entry/2019/06/21/124224

[snoyberg]

I didn't look that thoroughly, but a cursory review looks fine to me. I'm happy with this kind of direction too, thanks for pursuing it. If you're comfortable with it, I'd say go ahead with such a release.

[kazu-yamamoto]

Thank you for reviewing!
Rebased and merged.

[kazu-yamamoto]

@snoyberg I'm trying to fix tests on Azure CI.
Since doctest fails even on my local machine at this moment, I disabled it.
Now only Linux cabal-7.10.3 fails.
Would you give a look?
Because I think that this is not due to the HTTP/2 server library, I will release a new version of warp.

[snoyberg]

Looks like it's a problem of old Cabal versions not liking the Strict and StrictData extensions for upload to Hackage. I'll try to put in a workaround.

[kazu-yamamoto]

I saw green! Thank you very much!

[snoyberg]

My pleasure, thanks for all the other fixes!