Support ScanCode input bindings

[alice-i-cecile]

What problem does this solve?

Bind to actions based on the scancode sent. These correspond to the semantic values of keys, not just their position on the keyboard.

As a result, these are essential to supporting non-US keyboards (and for text entry).

What solution would you like?

Add an InputKind variant that supports this.

[Optional] How could this be implemented?

In order to handle this correctly, we'll need to parse the keyboard event streams themselves.

[Optional] What alternatives have you considered?

Assigning semantic value is out of scope for a first attempt; ideally this is handled at the winit level: rust-windowing/winit#1904

Related work

See bevyengine/bevy#2052 and bevyengine/bevy#862 for upstream work in Bevy.

More discussion in winit: rust-windowing/winit#753

[alice-i-cecile]

See also: bevyengine/bevy#5495