Manually changing the URL doesn't trigger a navigation in Hash mode

[posva]

from #345

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Currently, the hash mode is based of the html5 history because:

• more consistent across browsers compared to onhashchange
• all supported browsers support it
• Allows storing a state to guess the navigation direction and correctly cancel in when a navigation guard does next(false) and the user clicked the back/forward button. Note in vue router v3 it just pushes a new entry, erasing the history

This creates an empty navigation without that information when

• Clicking on a regular link with a hash
• Manually changing the url

I think we could change the line at https://github.com/vuejs/vue-router-next/blob/master/src/history/html5.ts#L75 to trigger a regular navigation as if the user called router.push. We should check if this doesn't break any behavior and add tests