Pick DAL Generation Feature to Master Branch

[coderabbitai[bot]]

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This issue tracks the request to pick the new DAL generation feature introduced in PR https://github.com/eggjs/egg-bin/pull/257 to the master branch. The feature enhances the Egg.js framework's data access layer capabilities by automating the generation of DAL code, making development processes more efficient. Picking this feature to the master branch will ensure its availability for broader use.