[DO NOT MERGE] schema update demo

[ahmedabu98]

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[gemini-code-assist]

Summary of Changes

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This pull request introduces a new testing module within the project, along with a demonstration pipeline designed to showcase dynamic BigQuery schema updates in Apache Beam. The primary goal is to illustrate how a Beam pipeline can automatically adapt to evolving data schemas by identifying new fields, inferring their types, and programmatically updating the target BigQuery table. This capability aims to enhance the robustness of data ingestion processes against unexpected schema changes.

Highlights

• New 'testing' Gradle Module: A new Gradle subproject named 'testing' has been introduced to the build system, enabling the development and execution of new test-related pipelines and utilities.
• BigQuery Schema Update Demonstration Pipeline: A new Apache Beam pipeline, BqDataSchemaUpdateDemo.java, has been added to demonstrate dynamic BigQuery schema evolution. This pipeline intentionally writes data with new, un-declared fields to trigger schema mismatches and subsequent updates.
• Dynamic BigQuery Schema Evolution DoFn: A core DoFn, UpdateSchemaDoFn.java, has been implemented. This DoFn leverages Beam's state and timer APIs to buffer rows that fail due to schema mismatches, infer new field types (currently INTEGER and STRING), and periodically patch the BigQuery table schema to accommodate these new fields.

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