[PR] [docs] Add documentation for COUNT(*) aggregation on primary key table [fluss]

["wuchong (via GitHub)" <gi...@apache.org>]

wuchong opened a new pull request, #2687:
URL: https://github.com/apache/fluss/pull/2687

   This pull request introduces documentation updates to highlight and explain efficient row counting features in Fluss tables, both through the Admin API and Flink SQL. The changes clarify the use of table statistics and pushdown `COUNT(*)` aggregation, including important notes about changelog modes required for Primary Key Tables.
   
   **Table statistics and aggregation features:**
   
   * Added a section in `website/docs/apis/java-client.md` describing the `getTableStats` Admin API method for retrieving table statistics, including row count, with a note about changelog mode requirements for Primary Key Tables.
   * Updated `website/docs/engine-flink/reads.md` to document pushdown `COUNT(*)` aggregation support in batch mode for Log Tables and Primary Key Tables, with usage examples and changelog mode caveats.
   * Enhanced `website/docs/quickstart/flink.md` with a quickstart example showing how to use `COUNT(*)` in Flink SQL to efficiently retrieve the total row count, including sample output and explanation of real-time updates.
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Re: [PR] [docs] Add documentation for COUNT(*) aggregation on primary key table [fluss]

["wuchong (via GitHub)" <gi...@apache.org>]

wuchong merged PR #2687:
URL: https://github.com/apache/fluss/pull/2687


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