Java api compatibility check report

[tfkfan]

Backward compatibility report

Added revapi maven plugin https://revapi.org/revapi-site/main/index.html , ftl template and corresponding github action to provide backward compatibility report

Short description: revapi compares two compiled versions of module/library only. So the 'install' goal is required to make it work. You can provide versions to compare as arguments:

-Drevapi.oldVersion=O.O.O -Drevapi.newVersion=X.X.X

Revapi supports web and txt reports. Last one is used here with freemarker template.

<revapi.filter>
    <archives>
        <include>
            <item>tech.ydb.*</item>
        </include>
    </archives>
</revapi.filter>

Block above is required for packages scan process management

Comment looks this way:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.88%. Comparing base (7c484d8) to head (4387efd).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #613      +/-   ##
============================================
- Coverage     68.92%   68.88%   -0.05%     
- Complexity     3131     3134       +3     
============================================
  Files           355      359       +4     
  Lines         15304    15328      +24     
  Branches       1621     1621              
============================================
+ Hits          10549    10558       +9     
- Misses         4094     4108      +14     
- Partials        661      662       +1     

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[Copilot]

Pull request overview

Adds automated backward-compatibility checking for the Java SDK using Revapi, publishing a text report (via a FreeMarker template) back to pull requests via a GitHub Actions workflow.

Changes:

• Add Revapi Maven plugin configuration (with text reporter) to generate per-artifact breaking-change reports.
• Add a FreeMarker template used by the text reporter to format a Markdown-friendly report.
• Add a GitHub Actions workflow to run Revapi on PRs and post a sticky PR comment with the merged report.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
pom.xml	Introduces Revapi plugin + reporter configuration and related dependency management.
config/revapi-report-template.ftl	Adds the FreeMarker template used to format the text report.
.github/workflows/breaking.yaml	Adds CI job to run Revapi and comment a merged compatibility report on PRs.

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