Add encrypted key-value store

[sebaslogen]

Why

Encrypted shared preferences from Google are deprecated and some apps need extra security. This ticket's purpose is to choose a good candidate library for this purpose on CMP/KMP and implement it in this project

Candidate libraries

• KSafe is quite new but very feature rich and the API is very simple (based on DataStore which we already use in this project) https://github.com/ioannisa/KSafe
• KValue is more battle tested but less feature rich and based on Encrypted SharedPrefs on Android https://github.com/Liftric/KVault

[t0mHagen]

@kseniia-q42 could you check if we already have a solution for this?