New UI for biometric authentication

[malik1004x]

Issue Number (if Applicable): Fixes #

Description

Revamps the UI for biometric authentication.

Instead of showing users the vague term "biometric authentication" it refers to the feature the same way as the OS does – Face ID or Touch ID on Apple platforms and Fingerprint Unlock on Android.

This required changing the package used for biometric authentication from the third-party flutter_local_authentication to the official local_auth. Looking at the commit messages, this change was done because the official package used to not support macOS – the current version of this package has the support (per its Readme on pub.dev).

In addition, an option was added to always require the PIN code when sending a transaction. This was done by adding an isTransaction input to authenticateAction - could be handled better after this flow is refactored.

Pull Request - Checklist

• Initial Manual Tests Passed
• Double check modified code and verify it with the feature/task requirements
• Format code
• Look for code duplication
• Clear naming for variables and methods
• Manual tests in accessibility mode (TalkBack on Android) passed