[kv/auto increment column] add auto increment column in Fluss schema

[xx789633]

Purpose

Linked issue: close #2103

Brief change log

Tests

API and Format

Documentation

[wuchong]

Thank you for the contribution @xx789633 .

However, could you open an issue before opening pull requests? Because a PR must be linked with an issue, so we can better track them. You can create all the sub-issues related to the FIP-16 under #1886

[wuchong]

I believe it’s cleaner to store auto-increment column information at the Schema level rather than within individual Column objects. This aligns with how primary keys are currently modeled and makes it straightforward to retrieve the full set of auto-increment columns without iterating over all columns.

Additionally, adding new fields to Column would require multiple constructor overloads, unnecessarily complicating the API.

Given that we may eventually support multiple auto-increment columns, I propose using List<String> (e.g., Schema#getAutoIncrementColumnNames()) instead of a single @Nullable String.

[xx789633]

Thanks for the comment. It's true that adding extra fields in Column complicates its API. Comments addressed.

[platinumhamburg]

Thank you for the contribution @xx789633 .

However, could you open an issue before opening pull requests? Because a PR must be linked with an issue, so we can better track them. You can create all the sub-issues related to the FIP-16 under #1886

@xx789633 I'v created a subtask issue #2103 and linked to the umbrella issue #1886

[platinumhamburg]

Thank you for the contribution @xx789633 .

However, could you open an issue before opening pull requests? Because a PR must be linked with an issue, so we can better track them. You can create all the sub-issues related to the FIP-16 under #1886

@wuchong Please review again when you have time.

[wuchong]

Hi @xx789633 , Please do not use "git merge" to merge branches, otherwise the changes is hard to track and review. Please use "git rebase" to rebase branches instead. IntelliJ IDEA provide an easy tool to do git rebase, you can find the tool via VCS -> Git -> Rebase. Could you rebase the branch and resolve conflicts, so that I can continue reviewing?