learning+website: add FlattenWith and Tee to Playground and Transform Catalog [WIP]

[mohamedawnallah]

Description

Python SDK

• Add FlattenWith to Playground
• Add FlattenWith to Transform Catalog
• Add Tee to Playground
• Add Tee to Transform Catalog

Java SDK

• Add FlattenWith to Playground
• Add FlattenWith to Transform Catalog
• Add Tee to Playground
• Add Tee to Transform Catalog

Fixes #32840

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[mohamedawnallah]

Hi @liferoad and @robertwb,

Is there a convenient way to resolve the following java dependency issues that I'm encountering? 🙏

I'm new to Java development and have recently worked with the FlattenWith feature introduced in Apache Beam 2.61.0. However, the current katas learning Java code uses Apache Beam 2.38.0 (link to the code). To align the versions, I compiled a JAR file for Apache Beam Java core from source using gradle build. The following files were generated in build/libs:

beam-sdks-java-core-2.61.0-SNAPSHOT-tests-unshaded.jar
beam-sdks-java-core-2.61.0-SNAPSHOT-tests.jar
beam-sdks-java-core-2.61.0-SNAPSHOT-unshaded.jar
beam-sdks-java-core-2.61.0-SNAPSHOT.jar

Next, I copied beam-sdks-java-core-2.61.0-SNAPSHOT-unshaded.jar into the katas learning Java modules in IntelliJ, and it recognized the FlattenWith operations. However, when I tried to run it, I encountered dependency issues, specifically:

Caused by: java.lang.ClassNotFoundException: org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.SortedSetMultimap

I’ve found myself in dependency hell and am unsure if this is the right approach. Any help you can provide would be greatly appreciated! Thank you!