[FIX] barcodes: barcode scanning on Chrome mobile

Before this commit, the barcode value wasn't triggered on
some Android devices with Google Chrome and using the Odoo app.

In fact, the keypress event may not trigger with some devices.
This is probably due to the fact that this event is marked as
'Legacy'.
See: https://www.w3.org/TR/uievents/#legacy-keyboardevent-event-types

To fix this, we can use 'keydown' event but we have to handle an
other issue: there is no way to know which key is typed.
The auto-suggest feature on Android invalidate all the following
properties: Keycode, charCode, key, which, keyIdentifier, code.
This is a well-known issue:
https://bugs.chromium.org/p/chromium/issues/detail?id=118639

For more infos, please read this blog:
https://www.outsystems.com/blog/javascript-events-unmasked-how-to-create-input-mask-for-mobile.html

As a work around, we create a temporary input field that stores
the barcode value.
The focus is set on this input when a keydown is detected.
Note that when an input has the focus, the android virtual keyboard
will be opened. We can't avoid this behavior.
The only thing we can do is to automatically close it after 800 ms.
See: https://bugs.chromium.org/p/chromium/issues/detail?id=662386

As this fix is specific for Chrome only, it's not possible
to test it easily. Some tests will be added in master.

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