Store session data in a secure way (#98)

* Replace SessionData DataStore with an encrypted SQLite DB.

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Co-authored-by: Benoit Marty <benoit@matrix.org>

plugins/src/main/kotlin/Versions.kt

@@ -23,7 +23,7 @@ object Versions {
 
     const val compileSdk = 33
     const val targetSdk = 33
-    const val minSdk = 21
+    const val minSdk = 23
     val javaCompileVersion = JavaVersion.VERSION_11
     val javaLanguageVersion: JavaLanguageVersion = JavaLanguageVersion.of(11)
 }