[rcore][web] Add EmscriptenKeyboardCallback()
to consume key events
#4956
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There are times when we want to use keys that are otherwise used for browser functions.
F1 -> opens a help tab (in Chromium based browsers, see #4951)
F5 -> refresh the page
There are many more key/key combinations that trigger browser actions. This PR seeks prevent the default browser actions by consuming all keyboard events. This leaves us free to use any keyboard cominations as we would in any other environment.
This PR fixes issue #4951