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

---------

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

libraries/cryptography/api/src/main/kotlin/io/element/android/libraries/cryptography/api/SecretKeyRepository.kt

@@ -19,9 +19,20 @@ package io.element.android.libraries.cryptography.api
 import javax.crypto.SecretKey
 
 /**
- * Simple interface to get or create a secret key for a given alias.
+ * Simple interface to get, create and delete a secret key for a given alias.
  * Implementation should be able to store the generated key securely.
  */
-interface SecretKeyProvider {
-    fun getOrCreateKey(alias: String): SecretKey
+interface SecretKeyRepository {
+    /**
+     * Get or create a secret key for a given alias.
+     * @param alias the alias to use
+     * @param requiresUserAuthentication true if the key should be protected by user authentication
+     */
+    fun getOrCreateKey(alias: String, requiresUserAuthentication: Boolean): SecretKey
+
+    /**
+     * Delete the secret key for a given alias.
+     * @param alias the alias to use
+     */
+    fun deleteKey(alias: String)
 }