Add Go example for schema-transform nested field access

[MemonaAmirAbdulHaq]

1. Description:
   This PR adds a Go example demonstrating how to access nested fields using the schema-transform feature in Apache Beam. It updates the documentation in programming-guide.md with a practical example for Go developers.

2. Changes included
   - Added a Go code snippet showing nested field access.
   - Improved explanations for clarity in the Go section of the schema-transform guide.

3. Why this is useful

   • Helps Go developers understand and use nested schema transformations.
   • Complements existing documentation with a working, practical example.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the Apache Beam documentation for Go developers by providing a concrete example of how to utilize schema-transform features for nested field access. The update clarifies the process of working with schema-aware PCollections in Go, making the documentation more practical and up-to-date.

Highlights

• Go Schema Example Added: Introduced a new Go code example demonstrating how to access nested fields within schema-aware PCollections, specifically extracting a post code from a nested shipping address struct.
• Documentation Update: The programming-guide.md file has been updated to include this practical Go example, replacing a previous statement that indicated a lack of native Go support for Schema transforms.
• Clarity Improvement: Enhanced the introductory explanation for Go developers on using schema-aware PCollections, guiding them on defining structs for schema inference and direct field access.

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Changelog

• website/www/site/content/en/documentation/programming-guide.md
  • Removed an outdated statement indicating that Beam did not yet support Schema transforms natively in Go.
  • Added a Go code snippet demonstrating the definition of nested structs (ShippingAddress, Purchase) and the extraction of a nested field (PostCode) using beam.ParDo.
  • Updated the descriptive text for Go's schema usage to explain how schemas are inferred from struct types and how to access fields directly in transforms.

Activity

• No human activity has been recorded on this pull request yet.

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