feat(mux): support query string in path

[x1unix]

This PR adds support for request URLs with query strings for p/demo/mux package.

Previously, mux.Router would fail to find a correct handler if request URL contains query string.

r := mux.NewRouter()
r.HandleFunc("hello", func (rw *mux.ResponseWriter, req *mux.Request) {
  ...
})

reqUrl := "hello?foo=bar"
r.Render(reqUrl) // Fails

This PR fixes this behavior and introduces a new mux.Request.RawPath field which contains a raw request path including query string.

The RawPath field is designed to be used for packages like p/demo/avl/pager to extract query params from a string.
The Path field, as before, contains just path segment of request, without query strings.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests

CC @moul @thehowl @jeronimoalbi

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[moul]

LGTM

I still consider that we should rename p/mux into p/router; what do you think?

Edit: Never mind, I remember that I chose mux because it mimics the http.Mux object with the ResponseWriter. Let's keep it named mux for now, and we can eventually extract the router part into a minimal router package if you're only interested in pure parsing. This can be done later.

[leohhhn]

I assume we will get some weird edge cases that fail; but this is an upgrade that is needed for multiple packages, so let's fix along the way.

[thehowl]

related #2876