feat: support for fido2 authentication

[VPNLINUX-1074] Drop support for Ubuntu 20.04

[VPNLINUX-844] Amend type hinting

[VPNLINUX-844] Applied improvements for RawResponse changes in Sessio…

…n.async_api_request

[VPNLINUX-841] Add dynamic module/plugin validation.

Make sure we wait for one refresh token call to finish before we retu…

…rn from async_refresh() (fixes VPNRND-272)