Add support for passkeys to Hypha

[frjo]

Fixes #4563

This implementation uses duo-labs/py_webauthn: Pythonic WebAuthn directly implementing it own Django wrapper. This is so passkeys are used as a stand alone logion method and not as a 2FA option.

The interesting parts are in passkey_views.py and passkeys.js.

Test Steps

• Test that setting up and logging in with passkeys works on Mac, Windows, iPhone, Android and Linux.
• Using build in OS support, using usb keys etc.
• Test that ENFORCE_TWO_FACTOR are bypassed for passkey users. Passkeys are more secure than 2FA.
• Audit the implementation for any issues.

[wes-otf]

This is exciting! looking forward to reviewing it in the next day or two!