rails up to 7.0and ruby to 2.7.2

mv lib to app/lib due to upgrade

removing concerns from autoload path

resolve zeitwerk issues

make foodsoft run for dev on rails 7 and ruby 2.7

fix mail file permission bug

fix database_config

fix articles controller test ActiveModell::Error

bump Gemfile.lock

app/lib/bank_account_connector_external.rb

@@ -0,0 +1,30 @@
+class BankAccountConnectorExternal < BankAccountConnector
+  def load(data)
+    @connector = create_connector
+    @connector.load data
+  end
+
+  def dump
+    @connector.dump
+  end
+
+  def connector_import
+    set_balance @connector.balance iban
+    cp = @connector.transactions iban, continuation_point do |t|
+      update_or_create_transaction t[:id], map_transaction(t)
+    end
+    set_continuation_point cp if cp
+  end
+
+  def connector_logout
+    @connector.logout
+  end
+
+  def import(data)
+    return false unless connector_login(data)
+
+    connector_import
+    connector_logout
+    true
+  end
+end