[docs] Add "Change Data Feed" feature introduction for "Primary Key Table" page

[wuchong]

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Description

To improve discoverability and align with industry terminology, I suggest renaming the “Changelog Generation” section (currently at https://fluss.apache.org/docs/0.9/table-design/table-types/pk-table/#changelog-generation) to “Change Data Feed”.

The updated section should clearly explain how users can leverage Fluss’s virtual tables—specifically $changelog and $binlog—to consume row-level changes (inserts, updates, deletes) in a structured and efficient manner. It should also include direct links to the dedicated documentation pages for $changelog and $binlog virtual tables.

This naming and framing align with established patterns in modern data systems like Delta Lake and Databricks, whose “Change Data Feed” feature serves a similar purpose:

• Delta Lake Change Data Feed
• Databricks: Use Delta Lake change data feed

Adopting the widely recognized term “Change Data Feed” will make the capability more intuitive for new users and improve consistency with ecosystem standards.

Willingness to contribute

• I'm willing to submit a PR!

[wuchong]

What do you think @polyzos @MehulBatra ?

[polyzos]

@wuchong +1 I had the same thought

[MehulBatra]

+1 @wuchong Great suggestion! I agree that renaming to "Change Data Feed" would significantly improve discoverability and align us with industry standards, good for SEO, if needed i can help to change.

[wuchong]

@MehulBatra assigned to you