[IMP] account_statement_base: Show action to create Statements

Before this commit, when a user clicked the "New Transaction" button, an error was raised. After this commit, statement lines are displayed to create new records.

account_statement_base/__init__.py

@@ -0,0 +1 @@
+from . import models

account_statement_base/models/__init__.py

@@ -0,0 +1 @@
+from . import account_journal_dashboard

account_statement_base/models/account_journal_dashboard.py

@@ -0,0 +1,16 @@
+from odoo import models
+
+
+class AccountJournal(models.Model):
+    _inherit = "account.journal"
+
+    def create_cash_statement(self):
+        # Totally override this action for avoiding the standard
+        # message saying that you need to install the enterprise
+        # module. We do the equivalent thing instead.
+        self.ensure_one()
+        action = self.env["ir.actions.actions"]._for_xml_id(
+            "account_statement_base.account_bank_statement_line_action"
+        )
+        action["context"] = {"search_default_journal_id": self.id}
+        return action