add basic unit tests for scalar function

Author: zacMode

test/sql/parse_tools/scalar_functions/parse_table_names.test

@@ -9,4 +9,9 @@ SELECT parse_table_names('select * from MyTable');
 Catalog Error: Scalar Function with name parse_table_names does not exist!
 
 # Require statement will ensure this test is run with this extension loaded
-require parser_tools
+require parser_tools
+
+query I
+SELECT parse_table_names('select * from MyTable');
+----
+[MyTable]

test/sql/parse_tools/scalar_functions/parse_tables.test

@@ -9,4 +9,9 @@ SELECT parse_tables('select 1');
 Catalog Error: Scalar Function with name parse_tables does not exist!
 
 # Require statement will ensure this test is run with this extension loaded
-require parser_tools
+require parser_tools
+
+query I
+SELECT parse_tables('select * from MyTable');
+----
+[{'schema': main, 'table': MyTable, 'context': from}]