Barcode scanners as IoT Devices

This PR is linked to: odoo/enterprise#4913

We updated the hw_scanner module to transform it into an IoT Driver. Since barcode scanners work the same way than keyboards, we will use a single Driver for both of them.

Here are the different changes that are introduced :
- Move all the js code that is related to barcode readers to a separate file for clarity.
- Move KeyboardUSBDriver to Community. Barcode scanners should be available in Community.
- Remove hw_scanner. We use the same route in the new driver (for Community) so backward compatibility is ensured. In Enterprise, we now use the longpolling to read the barcodes.
- Send real characters instead of the key's name. For example, we now send '_' instead of 'UNDERSCORE'.
- Add the possibility to select the keyboard/scanner layout from the IoT Device form view. An action is called on the IoT Box.
- Add support for modifiers: Shift, Ctrl, Shift Lock, Num Lock...

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closes odoo/odoo#35084

Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>

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