[SPARK-52269] Add cast SQL test and answer file

Author: dongjoon-hyun

Tests/SparkConnectTests/Resources/queries/cast.sql

@@ -0,0 +1 @@
+SELECT 'true'::boolean, 1::string, '1'::int, '3.14'::float

Tests/SparkConnectTests/Resources/queries/cast.sql.answer

@@ -0,0 +1,5 @@
++---------------------+-----------------+--------------+-------------------+
+|CAST(true AS BOOLEAN)|CAST(1 AS STRING)|CAST(1 AS INT)|CAST(3.14 AS FLOAT)|
++---------------------+-----------------+--------------+-------------------+
+|                 true|                1|             1|               3.14|
++---------------------+-----------------+--------------+-------------------+

Tests/SparkConnectTests/SQLTests.swift

@@ -83,6 +83,7 @@ struct SQLTests {
   let queriesForSpark4Only: [String] = [
     "create_scala_function.sql",
     "create_table_function.sql",
+    "cast.sql",
     "pipesyntax.sql",
     "explain.sql",
   ]