Add PubSub RateLimiter example

[tarun-google]

Adding new Streaming RateLimiter example

To run this on Dataflow use the below command

./gradlew :examples:java:exec -DmainClass=org.apache.beam.examples.RateLimitedPubSubReader -Dexec.args="--runner=DataflowRunner --project=apache-beam-testing --region=us-central1 --tempLocation=gs://taxi_rides_test/temp --stagingLocation=gs://taxi_rides_test/staging --jobName=tarun-test-ratelimiter-pubsub --sdkContainerImage=gcr.io/apache-beam-testing/beam-sdk/beam_java11_sdk:latest --subnetwork=regions/us-central1/subnetworks/private-subnet --rateLimiterAddress=<IP>:8081 --rateLimiterDomain=mongo_cps --topic=projects/pubsub-public-data/topics/taxirides-realtime --streaming --experiments=use_runner_v2"

GitHub Actions Tests Status (on master branch)

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new example to the Apache Beam Java SDK codebase. The purpose of this addition is to provide a reference implementation for users who need to apply rate limiting to streaming data pipelines reading from Google Cloud Pub/Sub, specifically leveraging an external Envoy Rate Limit Service.

Highlights

• New Example Implementation: Added a new Java example, RateLimitedPubSubReader, demonstrating how to integrate an Envoy Rate Limit Service with Apache Beam Pub/Sub pipelines.
• Rate Limiting Logic: Implemented a custom DoFn that utilizes the EnvoyRateLimiterFactory to enforce rate limits on incoming Pub/Sub records.

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[github-actions]

Assigning reviewers:

R: @chamikaramj for label java.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.34%. Comparing base (97c2faf) to head (df81213).

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #37992   +/-   ##
=========================================
  Coverage     57.34%   57.34%           
  Complexity     5115     5115           
=========================================
  Files          1392     1392           
  Lines        197103   197103           
  Branches       4817     4817           
=========================================
  Hits         113020   113020           
  Misses        80247    80247           
  Partials       3836     3836           

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