ios, core: better notifications processing to avoid contention for database (#3485)

* core: forward notifications about message processing (for iOS notifications)

* simplexmq

* the option to keep database key, to allow re-opening the database

* export new init with keepKey and reopen DB api

* stop remote ctrl when suspending chat

* ios: close/re-open db on suspend/activate

* allow activating chat without restoring (for NSE)

* update NSE to suspend/activate (does not work)

* simplexmq

* suspend chat and close database when last notification in the process is processed

* stop reading notifications on message markers

* replace async stream with cancellable concurrent queue

* better synchronization of app and NSE

* remove outside of task

* remove unused var

* whitespace

* more debug logging, handle cancelled read after dequeue

* comments

* more comments

src/Simplex/Chat/Core.hs

@@ -22,7 +22,7 @@ simplexChatCore cfg@ChatConfig {confirmMigrations, testView} opts@ChatOpts {core
       withGlobalLogging logCfg initRun
     _ -> initRun
   where
-    initRun = createChatDatabase dbFilePrefix dbKey confirmMigrations >>= either exit run
+    initRun = createChatDatabase dbFilePrefix dbKey False confirmMigrations >>= either exit run
     exit e = do
       putStrLn $ "Error opening database: " <> show e
       exitFailure