[tkaymak]

Follow-up to #40702 (fixes #40701): adds the CHANGES.md entry for the opt-in DebeziumIO full metadata option (withFullMetadata(true) / full_metadata=True / debeziumio.FullMetadata()) under 2.78.0 I/Os. The default output is unchanged, so no Breaking Changes entry.

R: @Abacn

[github-actions]

📋 Review Summary

This PR adds a CHANGES.md entry under the I/Os section for the opt-in full metadata feature in DebeziumIO across Java, Python, and Go (introduced in #40702, fixing #40701). The entry accurately documents the API options (withFullMetadata(true), full_metadata=True, and debeziumio.FullMetadata()) and default behavior.

🔍 General Feedback

• The changelog entry is clear, accurate, and placed in the appropriate section. LGTM!

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[github-actions]

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