refined, better HTTP server API

[Guest0x0]

This PR refines the @http.run_server helper, replace it with a new type @http.Server:

• @http.Server can be created via @http.Server::new(..). Separating creation and running of server allows random port for testing etc.
• @http.Server can be run via .run_forever(..). Compared to @http.run_server, @http.Server::run_forever has the following merits:
  • there is no need to manually loop over requests for each connection. In @http.Server::run_forever, the callback function only need to handle a single request
  • cleaner API: the callback of @http.Server::run_forever accepts three parameters: the request, request body as a &@io.Reaedr, and the server connection for writing response. These parameters have better separation of concern, making request handling code easier to write and less error-prone.
  • forgetting to call .end_response() no longer result in crashing or error, as @http.Server::run_forever can now automatically call .end_response() if the user forgot to do so
• @http.Server also supports plain .accept(), in case .run_forever(..) is not flexible enough

The old @http.run_server API is deprecated.

[coveralls]

Pull Request Test Coverage Report for Build 822

Details

• 7 of 10 (70.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.09%) to 78.649%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/http/server.mbt	7	10	70.0%

Totals
Change from base Build 821:	-0.09%
Covered Lines:	1374
Relevant Lines:	1747

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💛 - Coveralls