chore: Add a new rule for import lint

[laipz8200]

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Summary

part of #30506

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @laipz8200, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new import linter rule to enforce architectural boundaries within the api directory. The primary goal is to prevent unintended dependencies from the core.workflow module to infrastructure-related extensions like ext_database and ext_redis, thereby maintaining a cleaner and more modular codebase. It also explicitly allows a set of pre-existing, justified imports to avoid breaking current functionality.

Highlights

• Import Linter Configuration Update: The .importlinter configuration file has been updated to include the extensions package as a root package and enable the inclusion of external packages in the linting process.
• New Workflow Infrastructure Dependency Rule: A new import linter contract, workflow-infrastructure-dependencies, has been introduced. This rule forbids direct imports from core.workflow to extensions.ext_database and extensions.ext_redis, with specific exceptions for existing, necessary dependencies.

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[gemini-code-assist]

Code Review

This pull request introduces a new import linting rule to prevent core.workflow modules from depending on infrastructure layers like ext_database and ext_redis. This is a positive architectural improvement. The existing violations are correctly identified and added to an ignore list. My review includes a suggestion to add a comment to the ignore list to better track this technical debt.