make insert_dict() api less confusing

in SQL builders, order of calling individual functions should
not matter. Originally it was allowed to first call columns()
and then insert_dict as long as the two matched, but I'm not even sure
it worked, as we should have used set comparison instead.

It is also better to have symmetric API in

pypika/queries.py

@@ -907,10 +907,10 @@ def insert(self, *terms: Any) -> "QueryBuilder":
         self._replace = False
 
     def insert_dict(self, data: Dict[str, Any]) -> "QueryBuilder":
-        cols = data.keys()
-        if self._columns and self._columns != cols:
-            raise QueryException("Current columns differs from columns in keys")
+        if self._columns:
+            raise QueryException("Cannot mix use of columns() and insert_dict()")
 
+        cols = data.keys()
         builder = self.columns(*cols).insert(*data.values())
         builder._using_insert_dict = True
         return builder

pypika/tests/test_inserts.py

@@ -185,12 +185,12 @@ def test_inserting_dictionary_produces_builder(self):
         q = q.insert(2, datetime(2023, 4, 19))
         self.assertEqual("INSERT INTO \"abc\" (\"num\",\"timestamp\") VALUES (1,'2023-04-18T00:00:00'),(2,'2023-04-19T00:00:00')", str(q))
 
-    def test_columns_is_not_allowed_with_insert_dict(self):
-        with self.assertRaises(QueryException):
-            Query.into(self.table_abc).columns("a", "b").insert_dict({"num": 1})
+    def test_columns_is_not_allowed_with_insert_dict_even_with_matching_columns(self):
+        with self.assertRaisesRegex(QueryException, "Cannot mix use of columns.*and insert_dict"):
+            Query.into(self.table_abc).columns("num", "key").insert_dict({"num": 1, "key": "foo"})
 
-        with self.assertRaises(QueryException):
-            Query.into(self.table_abc).insert_dict({"num": 1}).columns("a", "b")
+        with self.assertRaisesRegex(QueryException, "Cannot mix use of columns.*and insert_dict"):
+            Query.into(self.table_abc).insert_dict({"num": 1, "key": "foo"}).columns("num", "key")
 
 class PostgresInsertIntoOnConflictTests(unittest.TestCase):
     table_abc = Table("abc")