[SPARK-52467] Add dfs-read-write and localstack examples

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

This PR aims to add `dfs-read-write` and `localstack` examples.

### Why are the changes needed?

To provide the following examples.

1. How to add additional packages

```yaml
spark.jars.packages: "org.apache.hadoop:hadoop-aws:3.4.1"
spark.jars.ivy: "/tmp/.ivy2.5.2"
```

2. How to use S3

```yaml
spark.hadoop.fs.defaultFS: "..."
spark.hadoop.fs.s3a.endpoint: "..."
spark.hadoop.fs.s3a.path.style.access: "..."
spark.hadoop.fs.s3a.access.key: "..."
spark.hadoop.fs.s3a.secret.key: "..."
```

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

No.

### How was this patch tested?

Manually run.

```bash
$ kubectl apply -f examples/localstack.yml
$ kubectl apply -f examples/dfs-read-write.yaml
$ kubectl logs -f dfs-read-write-0-driver
...
Success! Local Word Count 18 and DFS Word Count 18 agree.
...
```

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

No.

Closes apache#242 from dongjoon-hyun/SPARK-52467.

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

Author: dongjoon-hyun

examples/dfs-read-write.yaml

@@ -0,0 +1,44 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Since this requires a remote storage, prepare it via `localstack.yml`.
+#
+apiVersion: spark.apache.org/v1beta1
+kind: SparkApplication
+metadata:
+  name: dfs-read-write
+spec:
+  mainClass: "org.apache.spark.examples.DFSReadWriteTest"
+  jars: "local:///opt/spark/examples/jars/spark-examples.jar"
+  driverArgs: [ "/opt/spark/RELEASE", "s3a://data/" ]
+  sparkConf:
+    spark.logConf: "true"
+    spark.jars.packages: "org.apache.hadoop:hadoop-aws:3.4.1"
+    spark.jars.ivy: "/tmp/.ivy2.5.2"
+    spark.driver.memory: "2g"
+    spark.dynamicAllocation.enabled: "true"
+    spark.dynamicAllocation.shuffleTracking.enabled: "true"
+    spark.dynamicAllocation.maxExecutors: "3"
+    spark.kubernetes.authenticate.driver.serviceAccountName: "spark"
+    spark.kubernetes.container.image: "apache/spark:4.0.0-java21-scala"
+    spark.hadoop.fs.defaultFS: "s3a://data"
+    spark.hadoop.fs.s3a.endpoint: "http://localstack:4566"
+    spark.hadoop.fs.s3a.path.style.access: "true"
+    spark.hadoop.fs.s3a.access.key: "test"
+    spark.hadoop.fs.s3a.secret.key: "test"
+  applicationTolerations:
+    resourceRetainPolicy: OnFailure
+  runtimeVersions:
+    sparkVersion: "4.0.0"

examples/localstack.yml

@@ -0,0 +1,55 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+apiVersion: v1
+kind: Pod
+metadata:
+  name: localstack
+  labels:
+    role: s3
+spec:
+  containers:
+  - name: localstack
+    image: localstack/localstack:4
+    resources:
+      limits:
+        cpu: "1"
+        memory: 1Gi
+      requests:
+        cpu: "1"
+        memory: 1Gi
+    ports:
+    - containerPort: 4566
+    lifecycle:
+      postStart:
+        exec:
+          command:
+          - /bin/sh
+          - -c
+          - >
+            awslocal s3 mb s3://data;
+            awslocal s3 cp /opt/code/localstack/Makefile s3://data/
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: localstack
+spec:
+  type: ClusterIP
+  ports:
+  - port: 4566
+    protocol: TCP
+    targetPort: 4566
+  selector:
+    role: s3