In order to access encrypted fields of entities we need to be able to decrypt session keys of entities.

AC

• SDK has internal ability to resolve (decrypt) session keys of entities
• SDK caches group keys in memory

Tasks

• Add CryptoFacade which can resolve session keys given entity type and entity data
• Stub KeyLoaderFacade to be able to get group keys
• Implement _ownerEncSessionKey case (symmetric encryption using group keys)
• Implement resolving session key with bucket key (w/o authentication for now)
  • (this includes Tuta Crypt protocol)
• Depends on Task: Implement KeyLoaderFacade #7071

 impl Sdk {

 // ..

 // not an actual signature but the idea is that you get a handle to it only after you init session
   async fn init_encryption(
       &self,
       base_sdk_layer: BaseSdk,
       access_token: &str,
       encrypted_password: Vec<u8>
   ) -> Result<EncryptionSdk, SessionError>
}