[MIG] account_statement_import_ofx to v14

Rename module to account_statement_import_ofx
Add support for multi-account OFX files

account_statement_import_ofx/models/account_journal.py

@@ -0,0 +1,11 @@
+from odoo import models
+
+
+class AccountJournal(models.Model):
+    _inherit = "account.journal"
+
+    def _get_bank_statements_available_import_formats(self):
+        """Adds ofx to supported import formats."""
+        rslt = super()._get_bank_statements_available_import_formats()
+        rslt.append("ofx")
+        return rslt