chore: unify desktop and mobile databases (#764)

* chore: unify desktop and mobile databases

- migrate `package:sqflite_flutter` to `sqlcipher_flutter_libs`
- use FFI for all SQLite operations
- use `SQfLiteEncryptionHelper` for database encryption
- enforce encryption for new SQLite datbase implementation
- migrate existing SQLite databases
 - encrypt unencrypted ones
 - migrate database locations to unified approach
- drop dependency on sqlite

Signed-off-by: The one with the braid <info@braid.business>

* chore: add sqlcipher to macos CI

Signed-off-by: The one with the braid <info@braid.business>

---------

Signed-off-by: The one with the braid <info@braid.business>

ios/Podfile

@@ -38,6 +38,12 @@ post_install do |installer|
   installer.pods_project.targets.each do |target|
     flutter_additional_ios_build_settings(target)
     target.build_configurations.each do |config|
+      # ensure all dependencies are using SQLCipher instead of SQLite
+      xcconfig_path = config.base_configuration_reference.real_path
+      xcconfig = File.read(xcconfig_path)
+      new_xcconfig = xcconfig.sub(' -l"sqlite3"', '')
+      File.open(xcconfig_path, "w") { |file| file << new_xcconfig }
+
       config.build_settings['ENABLE_BITCODE'] = 'NO'
 
       # see https://github.com/flutter-webrtc/flutter-webrtc/issues/1054