interface for initializing db, which is implemented for appdatabase and
walletdatabase. TBD for multiaccounts DB.
Unified DB initializion for all tests using helpers and new interface.
Reduced sqlcipher kdf iterations for all tests to 1.
If user followed onboarding flow to recover his account using seed phrase or keycard,
then `ProcessBackedupMessages` property of node config json object should be set to
`true`, otherwise it should be set to `false` or be omitted.
Also, make AccountManager a dependency of Messenger.
This is needed for community token permissions as we'll need a way to access wallet accounts
and sign messages when sending requests to join a community.
The APIs have been mostly taken from GethStatusBackend and personal service.
