[SPARK-37000][PYTHON] Add type hints to python/pyspark/sql/util.py

[ueshin]

What changes were proposed in this pull request?

Adds type hints to python/pyspark/sql/util.py.

Why are the changes needed?

Currently type hints for the file python/pyspark/sql/util.py are missing.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Manually ran mypy.

[SparkQA]

Test build #144215 has finished for PR 34278 at commit a4afa75.

• This patch fails PySpark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[ueshin]

Jenkins, retest this please.

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48694/

[SparkQA]

Test build #144218 has finished for PR 34278 at commit a4afa75.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48697/

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48694/

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48697/

[SparkQA]

Test build #144269 has finished for PR 34278 at commit 61317e6.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
• class SparkUpgradeException(CapturedException):
• public class ExpressionImplUtils
• case class AesEncrypt(input: Expression, key: Expression, child: Expression)
• case class AesDecrypt(input: Expression, key: Expression, child: Expression)
• case class ShowCatalogsCommand(pattern: Option[String]) extends LeafRunnableCommand

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48748/

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48748/

[ueshin]

Thanks! merging to master.