Support creation and login with Passkeys

[FelberMartin]

I already started with this feature on branch feature/support-passkey.

Here are two blogs about how to add passkeys:

• https://developer.android.com/identity/sign-in/credential-manager#create-passkey
• https://medium.com/androiddevelopers/bringing-seamless-authentication-to-your-apps-using-credential-manager-api-b3f0d09e0093#172a