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

[dongjoon-hyun]

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

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

2. How to use S3

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.

$ 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.

[dongjoon-hyun]

Thank you, @viirya . Merged to main.