Add support for sharding while avro write

[CherisPatelInfocusp]

addresses #36846
fixes #36846

Add WithNumShards option to the AvroIO writer in the Go SDK, allowing users to explicitly control the number of output shards.

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Summary of Changes

Hello @CherisPatelInfocusp, 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 significantly enhances the Avro writing capabilities within the Go SDK by introducing support for sharding. Users can now explicitly define the number of output files when writing Avro data, which is crucial for managing large datasets and improving parallel processing efficiency. The change provides a more flexible and scalable solution for data output.

Highlights

• Avro Write Sharding Support: Introduced the ability to write Avro files with explicit sharding, allowing users to control the number of output files.
• New WithNumShards Option: Added a WithNumShards option to the avroio.Write function in the Go SDK, enabling specification of the desired number of output shards.
• Refactored avroio.Write Function: The avroio.Write function now accepts variadic WriteOption arguments, providing a flexible way to configure write behavior, including file suffix and sharding.
• Round-Robin Keying for Sharding: Implemented a roundRobinKeyFn DoFn to distribute elements evenly across the specified number of output shards.
• Enhanced Testing: Updated existing tests and added new test cases to thoroughly validate both default single-shard writing and multi-shard writing with custom options.

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[github-actions]

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R: @jrmccluskey for label go.

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[jrmccluskey]

LGTM, thanks!