Migrate and refactor data import/export

[javihgil]

No description provided.

[Copilot]

Pull request overview

This PR migrates the blog plugin’s data import/export wiring from softspring/cms-bundle data components to the newer softspring/cms-data-plugin, and makes the Data services only load when the data plugin is present.

Changes:

• Conditionally load Data-related service definitions when SfsCmsDataPlugin is available.
• Update ArticleEntityTransformer to extend/use softspring/cms-data-plugin transformer and support classes.
• Split Data service registration into a separate data_plugin_services.yaml.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/DependencyInjection/SfsCmsBlogExtension.php	Conditionally loads data_plugin_services.yaml when the data plugin class exists.
src/Data/EntityTransformer/ArticleEntityTransformer.php	Switches imports/parent class to softspring/cms-data-plugin equivalents.
config/services/services.yaml	Removes unconditional registration of Softspring\CmsBlogPlugin\Data\ services.
config/services/data_plugin_services.yaml	Adds Data service registration behind the conditional load.
composer.json	Adds softspring/cms-data-plugin as a dev dependency.

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