Navigator should not make assumptions on navigation string format

[vaadin-bot]

Originally by @jdahlstrom

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Currently, even though it is ViewProvider's job to parse a textual navigation state into a View instance and parameters, Navigator makes some assumptions on the format of the navigation string - specifically that it looks like "viewname/parameters". It should probably be ViewProvider's responsibility to also offer reverse mapping -- this would also enable things like navigateTo(MyView.class, params) (see also https://github.com/vaadin/framework/issues/2519)

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Imported from https://dev.vaadin.com/ issue #9435

[stale[bot]]

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