Passkey support

[PhilippC]

This PR adds Passkey support to Keepass2Android 🎉

For testing: Go to Android's settings under "Passwords, Passkeys and Accounts" and enable Keepass2Android as a service if you haven't done so already.

Then open a website or app which supports passkeys, e.g. https://webauthn.io/ and register a new passkey or authenticate with it.

Check settings - app - passkey settings to configure some behavior if you need to.

Note that this is still experimental. Don't rely on the functionality to work.

From a code perspective, this PR

• implements the CredentialService interface for Passwords and Passkeys, including User Verification and support for different CBOR Object Signing and Encryption algorithms and key types.
• integrates Passkey storage and retrieval to/from .kdbx databases, compatible with KeePassXC
• adjusts the lookup/unlock workflows in the app to work with Passkey requests

closes #2099

[Offerel]

Works like a charm for creating new passkeys. Also existing Passkeys from KeepassXC and KeePassDX working without issues.