[SPARK-36207][PYTHON] Expose databaseExists in pyspark.sql.catalog

[dominikgehl]

What changes were proposed in this pull request?

Expose databaseExists in pyspark.sql.catalog

Why are the changes needed?

Was available in scala, but not in pyspark

Does this PR introduce any user-facing change?

New method databaseExists

How was this patch tested?

Unit tests in codebase

[SparkQA]

Test build #141253 has finished for PR 33416 at commit fce2626.

• This patch fails Python style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test unable to build dist.

exiting with code: 1
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45767/

[SparkQA]

Test build #141257 has finished for PR 33416 at commit c7924f8.

• 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/45771/

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45771/

[SparkQA]

Test build #141302 has finished for PR 33416 at commit ac88451.

• This patch fails PySpark unit 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/45816/

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45816/

[SparkQA]

Test build #141310 has finished for PR 33416 at commit 3267bf0.

• 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/45824/

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45824/

[HyukjinKwon]

Looks like GitHub Actions changed something on their machine .. let me hold on for now..

[SparkQA]

Test build #141326 has finished for PR 33416 at commit ef18aaf.

• 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/45841/

[HyukjinKwon]

Merged to master

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45841/