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

### What changes were proposed in this pull request?

This PR aims to add `cast` (SPARK-45574) SQL test and answer file.

### Why are the changes needed?

To add a test coverage for Spark 4 feature.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass the CIs.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #168 from dongjoon-hyun/SPARK-52269.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

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",
     "variant.sql",