[lake] Make FlussLakeTiering pluggable to customize tiering job const…

[luoyuxia]

…ruct

Purpose

Linked issue: close #2281

Brief change log

Extract the core logic of parse arguments & build tiering job to FlussLakeTiering, the external implement can overwrite FlussLakeTiering.

Some thing like

public class FlussAliLakeTieringEntrypoint {

    public static void main(String[] args) throws Exception {
        return new FlussAliLakeTiering()
    }
}

public class FlussAliLakeTiering extends FlussLakeTiering{
 // todo
}

Tests

API and Format

Documentation

[Copilot]

Pull request overview

This pull request refactors the FlussLakeTiering entrypoint to improve extensibility by extracting the core job construction logic into a separate pluggable class. This enables developers to customize the tiering job construction (e.g., for security token injection) without modifying the main entrypoint.

Changes:

• Extracted tiering job logic from FlussLakeTieringEntrypoint into a new FlussLakeTiering class with protected fields and methods for extensibility
• Simplified FlussLakeTieringEntrypoint to delegate to FlussLakeTiering
• Updated README documentation to describe the new architecture

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
FlussLakeTieringEntrypoint.java	Refactored to delegate all logic to the new FlussLakeTiering class
FlussLakeTiering.java	New class containing the extracted configuration parsing and job execution logic with protected members for extensibility
README.md	Updated documentation to describe the two-class architecture

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