Feature/fga/biometric unlock (#1702)

* Biometric unlock : refactor a bit existing classes

* Biometric unlock : first implementation

* Biometric: add ui for biometric setup

* Biometric unlock : use localazy strings

* Biometric unlock setup : branch skip/allow events

* Biometric : fix tests

* Biometrics: add small test

* Biometric : clean up

* Update screenshots

* Biometric unlock : address some PR review

* Biometric : improve a bit edge cases

* Fix lint issues

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Co-authored-by: ganfra <francoisg@element.io>
Co-authored-by: ElementBot <benoitm+elementbot@element.io>
Co-authored-by: Jorge Martín <jorgem@element.io>

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